Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b53ab04a300bb8f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 19:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a9770bd2b4e6ad8f07af8a3ec058b51 SHA-1: f9cdc1b363e997d79f9b2e329b35958b87cd31a3 SHA-256: 2b53ab04a300bb8fb51487c6302ac722523ec97a8350691ccb8cc9a213c0b3b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or employs social engineering. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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 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://elesud.it/img_pagine/file/jupibefaxiwugalopizavoz.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bgud23pjkal7o9s4aehbqcp1u4/85830962265.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160942fe3b31af---gufonusiputipigovukaj.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/e7gknibfsqp2ltr23avi341fc1/wevodigemeno.pdfIn PDF document text
    • https://kawanmto.org/contents//files/vomesibenaburabaletim.pdfIn PDF document text
    • http://www.pilartangguh.com/file/bonefokaxerufowizosu.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160722d5a5cc36---18999328436.pdfIn PDF document text
    • http://gabortech.comadmin/file/67862701548.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb4c58680---peponalaw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161221e9f6d21e---gufoxerojemujipotatonub.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58c999c9c---27603807924.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/31734577737.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6778696a1---59400847780.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/zuxij.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/43144174457.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087321c451df---texavorixosufilaru.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/48837170427.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf739d75d---50681898464.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/nalarumomanakogo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/gavdaifq8qg3vliea80o6449q3/voluxasagavu.pdfIn PDF document text
    • http://itfind.ru/uploads/file/zekonelafe.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/76e0uimh18uhm1o5g5on1lqk31/vupabozetalatumur.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/kubireduzejim.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161036ed5ba0a3---petafumofezuvu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8728fdad8a---pilapevuwubeluziseg.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/sexoteludapaz.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/44726521268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=funcion+cuadratica+definicion+pdfPDF link annotation
    • 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_off0000d244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 18968 bytes
SHA-256: ea61cf1348ca04985f49e7c8d38dca5c353687f46bf364ed4759558735bf4802
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 10476 bytes
SHA-256: a8be42334f5ae7c6576dc3370abed25b95e35599144b10e5bdebb56bf21db737