Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7009a12b0ccf99c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 02:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a4aed725a790377874ad6fb1c56bac0 SHA-1: 293d73ef80c96df961a7cb501df46ec6bbf5fe2b SHA-256: b7009a12b0ccf99c0c0bdba02e94b770ebdfb1c0d4d09d2518e60d5778a02df2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution lure. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of linking to potentially malicious content. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=dod+carcosa+fuzz+manual PDF link annotation
    • http://cepsagibyachtfuels.com/images/photos/borefujilatigumokafoxaka.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ef325a289a457c8f1ac5ab8b6df76a2e/23084146778.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210604174443.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/lometuxufumu.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/serojiburazeseki.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jusitawejizugoge.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba847909a5---zobisiwezekusitimebalegu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608284b7a1358---terikitafepatizepenodedaw.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/wimejiravurevitejulizam.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/6347deca31002c9604252794e0c5ab5b/1394017403.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/4279798748.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/50638627505.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/15641066546.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/omfj1u5fp4hdhedv8cpmea9p14/nimepipapinuwuxabipoz.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xamoriv.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/ramidajako.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/00qcodumgj25o2gdvs9a27v675/jozaxawuduwu.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/waxefodumobodusesale.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f26a1e7e97a---51723129977.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784da123073---kinifamagek.pdfIn PDF document text
    • http://mfcpavpos.ru/file/lonidasajurewuteruga.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea8e09b4ad---71389199803.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/abe4ec6e0512023c8404d57e5ee8da0e/bapibadovexejojejax.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9a195te7uiham42m6tgnp9v445/58104458468.pdfIn PDF document text
    • https://cargobull.cz/res/file/gumetuliv.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_off0000cdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 17728 bytes
SHA-256: 4c3c4dbe12cd7f2b6f6918f6a52e1ddebeb4d9357ddab6f4141befcb11193dd8
font_02_sfnt_off000113b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 10476 bytes
SHA-256: 90aa9dc3e502f81d09d53595e3ec4ac2fbea7a0cdf823b3f93d5f27a325c49f9

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