Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf3c9a979c9ce54…

MALICIOUS

PDF

83.1 KB Created: 2021-07-25 17:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5bf17b41b90491bf4e101790b46424f SHA-1: 39ca396c82554db8ffdff6f3b916f2b0c1285c83 SHA-256: aaf3c9a979c9ce54d020a917cbd027a74b055861b07be4427487ff8b1463741b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve to manipulate search engine rankings or distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/743f4de14302f90ab8929c2b4e1edaff/pulatonatuwiluxov.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/o29a5jcdgi2b7ofodvqlh5kjv3/vokinojujefitidorajalix.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/xetenowuzunasezexugati.pdf
    • http://samrayburnclassof1980reunion.com/clients/873185/File/63519416198.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/45c615f2ada1f293cd916bf15427150e/rasefiluzofepek.pdf
    • http://ray-king67reunion.com/clients/41562/File/20367829218.pdf
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/74836211501.pdf
    • http://adamlegal.com/userfiles/file/dezinafibilarujigisubaj.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/2044aed28966aa99dbaf1384a334ae73/romejisagid.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c96f75140ef---58960705036.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b28acece2d---6013501416.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5850ffeb---466660627.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0pkpnoob1u7ll278trtk9qf236/dotofelotesanovin.pdf
    • http://tksvolga.ru/userfiles/file/85599536753.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/g7enldl1468cpoq4pjrkbvk1ri/varixetusuwoja.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71959cdf05---fuwokagonopobazabavupevip.pdf
    • https://cakenflowersonline.com/userfiles/file/48743389694.pdf
    • https://rosettes.it/userfiles/file/57838343546.pdf
    • http://ride.hu/images/uploads/files/vegasidileb.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e810ce40329---kejawakuwemodoxema.pdf
    • http://nessium.fr/userfiles/file/rovogepufexoxesedimibeda.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kuttyweb+tamil+movie+hd+video+songs+download
    • 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_off0000df48.bin
9059eb70b72446fb8e765bb5af961f4ce01d5cd779a68ff6b8a8d376d7dddf43
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 17260 bytes
font_01_sfnt_off00010c22.bin
a4bc525f2ecf1087c3f8f80a12b53393ff0755e1f5a84d86074ff0ac779ae724
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 11092 bytes
font_02_sfnt_off000125a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 16792 bytes