Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fc7024030bf6a8…

MALICIOUS

PDF

80.5 KB Created: 2021-08-19 02:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b24d616e7ce6ea6703c7381d9fd9d579 SHA-1: b28a8498b865922cc8754ddc0a09ca3f6fac810e SHA-256: b6fc7024030bf6a85413a7604ce98e08c69984e275fb2fbcdb20007013a2fb75
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://pritchardreunion.com/clients/81409/File/24872512558.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/65291815205.pdf
    • http://advicetao.eu/pictures/file/97382978608.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c66fd366ed---gelurogozukulozof.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3fcf20a9bc415ad0dc1ce3ae62706748/sabalex.pdf
    • http://fairway.cc/images/blog//file/166967751.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03af19890---25705468762.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/74259df4fdc32ad0010359e1198305d3/gilawa.pdf
    • http://veterinariogiardinelli.it/userfiles/files/fufox.pdf
    • https://machnhaduong.com/images/uploads/files/50178186541.pdf
    • https://auto-rujo.com/images-editor/file/jivodasi.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62392fd3f---47966310705.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/65819e1203bb0822a65b2ae79ead3292/42880900128.pdf
    • http://zafirkort.com/uploads/files/babinoxuwapixefugaxib.pdf
    • http://t-eamplus.de/web/editor/files/vemeberewefurapuzun.pdf
    • http://toyteepee.com/uploadfiles/file/210514043019228729e8b9wh.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/sejonirawozovirob.pdf
    • http://fxmeat.com/upload/file/9646a9dfd24811f72e21a183169a1d8b.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e9c599bb---vasisilu.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c798d97ec5---70211875639.pdf
    • https://belloverde.net/emailer/file/lakojowonujuma.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/19802705025.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=plantilla+de+cuadro+sinoptico+para+power+point
    • 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_off0000d4fb.bin
f978381ec8c199d9fe8c099857b11a7b2197eea0fe7df6c2d582ee1bc9b3f8f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 17764 bytes
font_01_sfnt_off00010223.bin
25d4c3c10a0f0ed4423eed9326bb488ad57d8fae1eefcf0f2d736096d35a8916
pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 10692 bytes
font_02_sfnt_off00011ace.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 16792 bytes