Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93d4e85cc390556…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 05:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29fb1122f6dbeb194836be942a2c9455 SHA-1: df39526e5349c7cdff7405a2b07ce5c76221ece0 SHA-256: e93d4e85cc3905561d9fa21f565eafdf2a5a65ebf7613db495c0ab74c8071fb6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs and link farm heuristics supports this assessment. No scripts were extracted, and the document body was unreadable, but the link structure itself is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613678c06402e---14515679710.pdf In PDF document text
    • http://masonhn.com/d/files/80403240593.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7t2g7loh7cplsvu8rk0kpr8tgb/lazopekevomomefuduzozewur.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079808c1b0d2---64202905227.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/newawal.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/wasosojodenedanaxazaleniw.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/lowagozuvuxamifeda.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nn1msj2d34egp7si0rf3g1dsc6/43191869413.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/8757925832.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/83353996467.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/af4087a41c23167329d9255874d341b8/gujakubevupuj.pdfIn PDF document text
    • http://alkanboya.com/files/file///fojevoza.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f200ab64ac---nurakivujaxawojox.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wesazupunejitoxi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7e4ac20c---43764415957.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/vitukuni.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/60e0ke2i5lgpsc6hnvse1m7pd2/vulapuviborofupuxumaz.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080998cdcb99---roxugiwevodef.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7ac3573c2---71339408856.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/7714246773.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/zupem.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9f55061c4e803851c24253e821a1902a/99719291203.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/puzukala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nissan+juke+2013+manual+bekasPDF 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_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 18060 bytes
SHA-256: cbeff4d6b5c61c432e5bc0330ce3144ccc572e5a152ea46c24879431093fa07d
font_02_sfnt_off00011cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBA 10856 bytes
SHA-256: fe7fd38b135728ea9223df46579037fbe1a985418f83cea977d5fc0302b3583c