Malicious PDF — malware analysis report

Static analysis result for SHA-256 42061a61ba0c35fa…

MALICIOUS

PDF

89.3 KB Created: 2021-08-02 21:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfcf63a98691dadeed87d21b32611eca SHA-1: f73f425cd89eeeae7c683c529345c2ad4b9603ba SHA-256: 42061a61ba0c35fa30e6eeacfb6597f1d53da42366064087ddcca4d476f10572
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ippinnudon.com/uploads/files/vesuzavelupi.pdf In PDF document text
    • http://hiddenforrest.net/clients/76790/File/3672286825.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/tepufow.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee6c77ef1---70469908695.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/83a413c6b12124657791a5d72bba6d45/71579782380.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/22971859606.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/lulinak.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/punonutamabagirakuzewuli.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/monumexutezedifugidogul.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/q3fscjg5ev7ip07nmc8mfchsfj/daxezipoxomajov.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/70e0030a6fc0a01aaa516a85cb04b7dc/gudaximetifokixuteben.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zevifod.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b108786a30---59597436747.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/81da61c6f28c300b67d666c1dc689b85/wuwivujuz.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e9120eda05299d1ec9ef98855acd3aa8/podovizajat.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cd3b96e5d7---91337672980.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/penulemixukokizibagup.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/zulomozada.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/52276267389.pdfIn PDF document text
    • http://scro.ru/pic/file/33248130702.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/98276043230.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7d58a220152c35b2498531eefa3960c1/90058279024.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/68634135464.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092a932b03ea---18532757894.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/fexosagupadezaneju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+unmarry+cobb+accessport+v3+without+carPDF 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_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 17760 bytes
SHA-256: 55c574e8c50011fae4877020d33ca349cb7523e2b723ccee308afbac647a52fa
font_01_sfnt_off000124ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD1 11260 bytes
SHA-256: 16da88f07bb12a3a6c4112f696e9e57fc705a250695da7ca4e1ff161b6b8bd86

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