Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb759901f8fa5a8…

MALICIOUS

PDF

176.7 KB Created: 2021-05-10 15:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 836ba6683773a33d053500beee3ab268 SHA-1: 0cd9143cbe8763b2b0284d0fafc4a3c674cca036 SHA-256: cfb759901f8fa5a8d6befb0b7b1555a105b545ff7e81d41ab5b2af1282574860
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The presence of 'utm_term_redirector=True' suggests an attempt to obscure the final destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/723821df3f3491ca2ca577466961f707/31474358358.pdf
    • https://africanresearchcenter.com/userfiles/file/tibefesigokivek.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7411df626---65419062666.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/aaqs4lguq4e7llvr6lvi6mkl26/pumiw.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/87c08ff646b89d8645c5ebd1ec1a8a93/35054676875.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/s0egrtvvf1m051tup64c2814p2/pujusodifonemetas.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qposknrnt9sjnlur3c4qth0lui/88138197739.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1b05c9d6---mabavova.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f52aeef7b---69315394680.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/00dfcc644a19885480d5ec4f7edee849/78885650168.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/sl36scbhn3afnsffai9orp4122/zedubodabajewazuw.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6i7f3sep64m0ojugq2mbk1urf0/polanorivatan.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99a16b105---doreso.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072449c2ef68---lamobigowezojezedares.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4e20ba54---42116418643.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9cabb1af2f0b0f58814cdcb0b5bb2731/40917512769.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=manuale+blender+2.+79+italiano+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000277a3.bin
699298d6d50e39932735d084cb94eff9a7e69a5382250427e17d5fe68f0836f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x277A3 5400 bytes
font_01_sfnt_off00028a20.bin
d549f6280ea18d6894b2aebcbb4cabd4fdd349c0f0625b2548b529b64d1c29f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28A20 12464 bytes

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