Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1d6ca3229106a4…

MALICIOUS

PDF

75.0 KB Created: 2021-06-12 18:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4ba77cdeb4fa2a6ccf776a1f3cc3ad29 SHA-1: e8e22062c771db92cfb1d447c15e9b33d31c4263 SHA-256: 3e1d6ca3229106a46649316fd264ebd2b772cb4a7c55bf35f7213f51a0fc8244
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or engage in SEO spam. The presence of external URIs and compromised CMS upload links indicates a pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=small+letters+worksheets PDF link annotation
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ftu6lhskkrghppifvg3tgdnt85/57217201162.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1321c020e0---36699989120.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/bnqgi5ktkt52ejduosl2u3p2oc/83028738841.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/93uruk2s3ijl3uu38r2bcnvp02/bepufofuvezizuko.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16091667ca182a---4630263895.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a524532b487---75449378756.pdfIn PDF document text
    • http://texmet.pl/userimages/file/77775725781.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/871948fba3421606cc79632c483119a7/51401031692.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/86306620492.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160713dc5bb8dc---bidevawavuvodufelo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5bb44e1cb54cc8fb758938c19ecb94a9/fusukow.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/o3l8q578dgb7d5ujrerc85vmb4/29976473434.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/qv361q4r2eumb7ifn0h8hccn2i/jovunubataxis.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a7597ce47dbfe96086d4f46c573ddbd/wiwopiwumenozepowalos.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/25191218929.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/tixuw.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/41382561703.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 5184 bytes
SHA-256: a056b871a9d3895d06a97d9ad408a7d6a6609872c11d33e9237de53fb7cd02a0
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 10928 bytes
SHA-256: 462c01ac043eca176683584d118e9371269f5bb4c79b34cfd710118eaaedc1f6