Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6084f2212e4f43…

MALICIOUS

PDF

86.4 KB Created: 2021-07-03 11:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b22b9d890cdc124f3fe59f22a948166a SHA-1: bc811fa28e3d0ae425d533ef79a11a9d15866aee SHA-256: 1d6084f2212e4f430c625168836699bc4346f982e66a9c756a4d3f0a4b2599da
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable domains, 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 distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://ambvetfanini.eu/userfiles/files/76649582094.pdf
    • https://avgdesign.com/userfiles/file/tuvefivuxezimokot.pdf
    • http://xinyuemu.net/assets/202106/files/20210616172155114428.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb773ae1811---48268442760.pdf
    • http://bhs1966maui.com/clients/64750/File/xonozozagipagu.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b855b177fbf---33246170225.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ltjfugss8al3b2b1un3pg4ifq2/rutiwi.pdf
    • https://vipbeachhouse.com/uploads/editor/file/katas.pdf
    • http://alnoorcity.com/userfiles/file/mifumumetuvemona.pdf
    • http://amirafouad.com/uploaded_files/file/pegevibavigo.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea4460442---doxifaboxisatikatugose.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4699cdf69---24458701024.pdf
    • https://preprodpcb.com/userfiles/files/93840902794.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6f266f49---54698989460.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776b47af736---76488730318.pdf
    • https://prosperitas.be/data/assets/file/60175851676.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/fbd849a35f9f71ae0759abcf12525007/64866952843.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bfe0356f---vanopidulejijuxikeluw.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e49a53b6d505dab003c5e2ab60de9d96/xuwezovetidibu.pdf
    • http://begemot-rus.com/uploadfiles/file/2021052103171273499.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f725c54fc---mizogimajobivo.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/af1ef9587b6fc241ad9b6c7f1bb2b033/senivogufibanaxob.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/34d7a4888dd556d24e1cf127900c82af/29423927049.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c770a6c8c07---bizosekiwarojufipeju.pdf
    • https://audreyheselmans.com/_files/file/81739786609.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d1b7d2e68f289c9fa8d8a6402df9950a/55171128375.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=general+equation+of+tangent+to+a+circle
    • 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_off0000ef6d.bin
acecf48f515094f515827561a9ef7e06ad19cc92d216db8d508b60dffa63f6aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 16900 bytes
font_01_sfnt_off00011bb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 16792 bytes
font_02_sfnt_off000133cc.bin
ecfafaf8aeb478488b360eaad77ee0c2da1ba8747be9d08e1ddf26af4c0cda50
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 10628 bytes