Malicious PDF — malware analysis report

Static analysis result for SHA-256 c285746f8bed93f2…

MALICIOUS

PDF

75.9 KB Created: 2021-06-30 19:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a4637c8a474d50ac390279da96b2577 SHA-1: ecdd41f0bb952881c64c1920a4236fba34018358 SHA-256: c285746f8bed93f234bf1743b54e91420d43c4cfdad7ea52565f458a87a6ff32
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. This suggests the PDF is designed to redirect users to potentially malicious sites, likely for phishing or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://casaperferiesantamariagoretti.com/writable/public/userfiles/file/rezisepi.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4827986e---duwig.pdf
    • http://peak-experience-japan.com/92745514216.pdf
    • https://dadesigning.com/daduserfiles/files/32575432711.pdf
    • https://daotaolaixesontay.com/uploads/file/gepawomigotexumifafe.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608335b52f7f6---rifuzanatufiwebakefeje.pdf
    • http://vucert.vn/uploads/files/24862870133.pdf
    • http://sjhrz.com/images/upload/File/labiwatuguxav.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfab45a60f---todano.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fb052e9af---fujudi.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0765a75e5bc7877c45e32fc6285af0b9/9805987575.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160703fbd08749---56526507935.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c110148877---5221428881.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210522205417.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/pomivozev.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/6pdcc4ll38kgb7kqm565ajp2fk/52662904257.pdf
    • http://blesk-stroy.ru/userfiles/files/37778686350.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c113d14eb67---20515581721.pdf
    • http://allamericannursing.com/userfiles/file/nibuzipevujavedapivofaj.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/27e7051879ea1d7f46a05e15123df1a6/lifewuzobexukeri.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a91c0172---baxowupivogivarato.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176b4e1300---zejewirininopi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=jack+russell+puppies+for+sale+near+me
    • 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_off0000c5a9.bin
274a79830f9a09adb081a7634314dd72ac742ae8aacd34c205c4d043d15c45f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 10724 bytes
font_01_sfnt_off0000de4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 16792 bytes
font_02_sfnt_off0000f65e.bin
cc3519151c391cd459b0b1fc8b69d02bec57008ea91697d3249380591973a1be
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 16304 bytes