Malicious PDF — malware analysis report

Static analysis result for SHA-256 311368bb87249a29…

MALICIOUS

PDF

80.0 KB Created: 2021-08-16 12:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c077523a8c69ffdb22c8a15dc6582de7 SHA-1: 4206597405527a0d8559835bb12da32a425b7ba9 SHA-256: 311368bb87249a29c8796f59a2c6764dbb2961f246b34b793c628f5f5dd4d513
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised CMS uploads. The PDF contains numerous URLs, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://jlm-kg.com/uploads/file/talav.pdf In PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/lisodoli.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/tamuletarilalidariro.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/wexigopes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c38426b6---98856405873.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfe683a8fc---majemoluzisi.pdfIn PDF document text
    • http://allycatering.com/userfiles/59916174658.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608977be65408---gisojituke.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/kiworiteduladisupolujob.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079248d6433e---wumilotiza.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/97671685337.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kisawitotak.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/wadetewefiki.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/zuwezeza.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/21571414682.pdfIn PDF document text
    • https://isosklo.cz/uploads/63271633121.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/886a3cdd1cf1d428d1d1c77cf26beed4/32058307683.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/3822568980.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/aabe5b025e2035f8f75350cf681cc0d0/pefunigape.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/17901383886.pdfIn PDF document text
    • https://noventa.cz/media/files/file/zasogewogatejeluve.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/piminedifunaxamagajabolok.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7a7b7a591---nonivulutunaxu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-12/20210512233017768164.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/3008457393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=aa+kahin+door+chale+jayen+hum+mp3+song+320kbpsPDF 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_off0000d242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 11832 bytes
SHA-256: 9301f5846c3b2417cd597ed0e8a6479ccdb54d7dadf47cad9bdc62e04643bc50
font_02_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 16780 bytes
SHA-256: b75df0eb88a11b9a364196f655b5edcda457594cc028cc7b9bc1047e35baf227

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