Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfbfa2f19bfbf9a…

MALICIOUS

PDF

73.0 KB Created: 2021-08-18 20:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b72a3ddc26811485691b66f10dc55db6 SHA-1: f553533ec9608ff1dc5702afd61f5341a3521801 SHA-256: bbfbfa2f19bfbf9abbf470fbbd9b75021b999b6e89299184629cc1855623d226
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097478ca6bb6---94015820531.pdf
    • http://www.zywawiara.pl/pliki/paxewadujalimovasar.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b3b697ac---10456864162.pdf
    • https://evergreencans.com/userfiles/file/23574000264.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2efb1191f6334d2700f899da09b4d7e2/fizijav.pdf
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/46320807031.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/12839119524.pdf
    • https://advik.net/userfiles/file/58361586592.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5dab058a7---82085710793.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4dac42c12---juwuguwekolavelowinivi.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e7573d26---79153509831.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d6613303---powuwegitigiz.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/boaiftp29ae3umr9b4dosah9dd/15250209752.pdf
    • http://hoteldanang.vn/uploads/images/files/dalusejavumej.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ac1aaac6---13701950553.pdf
    • http://parkwaywest1974.com/clients/861606/File/55982715428.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ae36baeed00efb1810fc6847f1798291/86552152253.pdf
    • http://sattosushi.com/uploads/files/xelitojepulepagujux.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776bc6da78b---savowen.pdf
    • https://atraba-holding.com/userfiles/file/xijofofatonemiwiwezadet.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/de3ec8d086be6226a84d3207b696dd0f/20329098631.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lecturas+para+evaluar+la+comprension+lectora+en+tercer+grado+de+secundaria
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb8e.bin
9ff2e84d8802b47310eb3bccb4ae224e0343ec359048ff03ffaf641678f41a3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8E 15452 bytes
font_01_sfnt_off0000e229.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 16792 bytes
font_02_sfnt_off0000fa40.bin
563f25c44ef2e213bc55a228abf480aa55da4c4114f2090d841201a2d400c1cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 10980 bytes