Malicious PDF — malware analysis report

Static analysis result for SHA-256 226514ce361f23f0…

MALICIOUS

PDF

91.1 KB Created: 2021-07-04 22:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03f26c4fc09adb697de725e055638ff5 SHA-1: 622cbeb0cd9304f2a67d3b6775e983227b5791a1 SHA-256: 226514ce361f23f0c252eef2247c3a4677a727dd4396dd0d7d697bf7cb2d226f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing content or further malware. No scripts were extracted, but the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://hanhthien.net/uploads/file/bizosixexawoxofur.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/84f75280e398fcb985e119bd71b77e1f/wowuzifimevujewu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/4fe0t4n1r170rmmoj17cnkbvo6/71326335610.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/gefojigeriwewixinumaju.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2d429c42---56219112270.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/2du509miqibfha9jv750q90pr6/lapizize.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/87864516420.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0cb6q41l9c124mcoeg4rkaioc0/2715452588.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2dbd69b20---bajavatuvesoredozezomax.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dfb5164fb---tonakozipidut.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/14107474747.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/caad2179934ba2f16738088e1373b3df/13674094901.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/zalisiwarim.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/xazibedi.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/62763723948.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af756f5f4ff---38575571772.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/50329309344.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/jakekunizexi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd0f726340---dowizis.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607c868691be8---24839952305.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16085bbde95b88---biseduwonenapiroros.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608441f13c6ee---mesedawafelerotalonoxiv.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/74190027029.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/dibuvepotereligexuledomu.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/rokulodusabizibovozizeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=enlarged+prostate+turpPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 16996 bytes
SHA-256: 2388fab6e1037187a9861ce7d66836d554669f3785e0c86ad66370cc64ac1b42
font_01_sfnt_off00012f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001476b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476B 10556 bytes
SHA-256: 8804342bcca68f0f3b8cce19293190334dbedb84c832532bab8b0c67b8a93b47

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