Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2acf22b809977ae…

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 22:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f131a23881cd35d8a82c61dcae767710 SHA-1: 983f66ea340baf25d7c154405a6a26ff8fd7ff39 SHA-256: a2acf22b809977ae135ae0281cbe180211bda473ded6c17f11bb02abf625dee9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous websites, many of which appear to be hosted on compromised CMS platforms. The URLs are designed to lure users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/uplcv?utm_term=hygiene+theater+is+a+huge+waste+of+time
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/973a588614dc84b49986fb3c1eea158d/60412286955.pdf
    • https://beauti-full.ru/uploads/files/61745509522.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d0aef223236---vuwojipogotupexepemogi.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6dd7f50148569a89745963c9bcb84820/soxalet.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098444e618dc---mupifiwovagivudapuge.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93eabaf34---jonupekomalolo.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8a3516dab68afcc9dd39a703c12c30c0/567082645.pdf
    • http://birnagarcollege.in/userfiles/file/97464123870.pdf
    • http://mikailang.net/userfiles/file/20210611074646_33673830.pdf
    • http://sun-green.de/ckfinder/userfiles/files/27077708519.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/sepupuki.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89252e35c7---fulenoxu.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e4ce1ee27---84218125757.pdf
    • https://seerupit.dk/assens/file/wawibalurodimawaput.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/abbfedb701f46ee1e47b38ef6b9af29f/rifoga.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a33b0352a---vezalejawinaridujuxar.pdf
    • https://secolink.sk/userfiles/file/pedaxuvemanogujap.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/53440116200.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4b587a10b45e0906ee25b74a28dc87aa/79635614642.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099201b8b01b---zerawowiv.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/42643964479.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2qrnlonvamdtkhaltltv2glau5/90848003998.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411864f569---24622226223.pdf
    • 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_off0000f201.bin
c00f23d0f7cbf2b4da3804a37da0ebb1c0a84cc523fd2ea87270e8fa6b656051
pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 17636 bytes
font_01_sfnt_off00012084.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 16792 bytes
font_02_sfnt_off0001389b.bin
089ea5a1448bf1233a19285098988231de393824a88a1194b1b466b4695c8ec4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1389B 10908 bytes