Malicious PDF — malware analysis report

Static analysis result for SHA-256 30278e522b621c7b…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 20:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d048f51b09f770987fa950ccf1bef0fe SHA-1: 9788d47eabbb98f8da34ec0d4b9dd6434a0c0c25 SHA-256: 30278e522b621c7bdcbb9965fa3b332567abd3dac31b7c008027480368aa31b7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://ecohost.ru/pics/images/file/15225811671.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dfpaspsc8jb6n9vssbmrdgnj28/90097459332.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/mibudotetik.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609429922cbc5---96346819919.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/zelugunifubede.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lakos.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/70647657661.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/gezikodigidira.pdfIn PDF document text
    • http://jinohair.com/upload/files/sapafad.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/pomatilabozivafetuvine.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/20b125701dc93d022c150a9faba13a7c/40608059857.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/51216448808.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d231f88adad---rulamojilafodabo.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/63208633562.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c66db1f2e---88977572183.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb4736cbc---werewirufezoluruniladofop.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/kugcn6im0499dqpt4fjehiv8k2/toxasatesedopubafon.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/pukodimefitofevi.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/34849683659.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a56a558c4---zekarezilexenibuk.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d626c36379---vuwun.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8f3761c0b234116604f4898293000bd1/visezeg.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/77701079255.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6607a26d7d---89114160240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+long+it+takes+to+boil+eggsPDF 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_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 10492 bytes
SHA-256: 96d87735453b5d87dd42b771ffd3b2d73f6ad4e5551f9f3e6addbd2ba35c9bbe
font_01_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 17540 bytes
SHA-256: 7773e471f5402e951324ad7372eaa618d5e6b30d9d2d189d2011dcf9cab56e8e
font_02_sfnt_off000135ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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