Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52e955647f31a6e…

MALICIOUS

PDF

83.0 KB Created: 2021-08-19 06:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2b866e3d845cac6f7ed4888dd55eac1e SHA-1: d4c809f001f79866ba6e7486020b36b41b629347 SHA-256: b52e955647f31a6e806952ff986484fe1ae61b36387502dd9207f12e07676705
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The presence of PDF_ACTION_PARSER_EVASION and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests malicious intent. The file likely serves as a lure to direct users to malicious content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=samsung+rf26hfendsr%2Faa+freezer+not+working PDF link annotation
    • http://liily.jp/upload/file/20210728055837.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/cquf569dmu6aahuqipisbqn0gv/tiwewawonuxerokojavuxafe.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb0f4b2ce6---21995513573.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611d50d3c658f---dibokujefogibaboza.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e6d8f5363a76ecd79cd784e4d2b9525c/suxezokemejuk.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-16/20210716084311981886.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc6d9102b---2060806663.pdfIn PDF document text
    • https://geniodelweb.com/file/wesomor.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/videsorisenulevifi.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/riginifeduwiwidojixix.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/noxisojatikug.pdfIn PDF document text
    • https://marigabung.com/contents//files/mimoxog.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/45882621440.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/38444044509.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/7620e75ccf895dd36c15c517fdcb7a93/sazatokazewurosixuzowe.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b030c7be9---fobufonimade.pdfPDF link annotation
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5d1e445d---fabutolalimajuxadojuw.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/sidej.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/53qvkfa8ek4c8o6tmr6gvfbuj0/doloxikulefojupe.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/65246546558.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2bfaa06b5---89724301831.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/vapavixibejesabolox.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/61273477644.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/wetezi.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/so82mbj9f75bm2b1hh3opreha2/zozomixamapujevigomumepo.pdfIn PDF document text
    • http://thepducphat.com/upload/files/zerim.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 16520 bytes
SHA-256: c75745317d885c345e9569169f5bfb4d08717bd3764f9927f2dd7f169748244b
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 11488 bytes
SHA-256: 264d01a8e9db21b1ad07893aa7f3758cba2a0904d6acde1f471383b9c007edbe