Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b3a6c33546eab7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 16:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54027f9fe0622820417fc65223824e77 SHA-1: abe040550207e9cba92a3c08a35721832883c0ac SHA-256: f6b3a6c33546eab73f5b48d6c95d5cf88ef0eb4593cf6e0f4d4bc240c9dd2db9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://garglob.ru/uplcv?utm_term=yamaha+mg16xu+mixer+with+usb+and+fx+manual PDF link annotation
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/14719311ce5efb2c3e294b1066660f36/59885729659.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/40844797805.pdfIn PDF document text
    • https://lazerom.pro/media/file/15919309233.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160784ca918d26---nogarekexemoguzogunok.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/740cc6863056b15761d2f863af4b6719/raxogefumuw.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/69858236402.pdfIn PDF document text
    • http://blueyee.com/upload/file/172214206430.pdfIn PDF document text
    • http://cartopack.com/Images/file/41515037928.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e64f235e98a4b228c2aae9fc4f6516ba/62664702551.pdfIn PDF document text
    • http://med-os.com/user_upload/file/ziledurumug.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d08f243bc---talewelujadaba.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mijos.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/41617889511.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/bimodesagu.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/83358254473.pdfIn PDF document text
    • http://anupbolivia.com/images/files/kubivinarekesad.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b711efd5d---busadanufuli.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/vukisabikido.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/43550415193.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/36839299367.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612beb8ae9c68---98845228556.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/vutun.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0ebab2ff8019132bfcc01017c888eb1b/jepulakon.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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 19200 bytes
SHA-256: 37220ff4ee05cc749c0978e7b1069dad402802fbc6b4b6b5d3d25563098cce8f
font_02_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 11312 bytes
SHA-256: 8797a945eb15dad6dbc6c174849b8d9a24794b70e2b0d5f27a7f3011a97364dc

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