Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7c616c5c8f1e81…

MALICIOUS

PDF

73.0 KB Created: 2021-04-30 20:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4d7c728d66b74c25a54313f52f6ddca SHA-1: fa4313da39e62ed1a1bfde3ce489b5b4eecf53d0 SHA-256: 6f7c616c5c8f1e81c4306947bee9cdd66191923b1f3ef1a9b632cef6c0aaf605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though partially corrupted, suggests a lure related to a children's alphabet PDF, which is a common tactic for phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to redirect users to potentially harmful content hosted on compromised infrastructure.

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 http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608364b35dc48---73054061601.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75cbd3b11---buzobujedokuzewixosuw.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b6073502e33d01e9a0118f83520b31e0/foporusema.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b271473785---33654468075.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/ac9sfh9q3gh5hnntr2749k6f8r/sagimubap.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa42cd746---21601451938.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8e41aa9af2340efc31856e870829b7c0/pojojumotan.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o6eh40dodq451hh27i0bk3br60/97338904292.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed256bb344---suvafufagojelepezexu.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/nb7tn85jvmv295cnvkqvve1pv7/vifazezibutoliboniga.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/a89f50a5a16374c5340f52eca6044798/gebitojawodawudutopufazo.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160808c4056f9c---sugolorukageman.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/4ca741480c57f14bb223d9b5df18d723/fusasebakibiv.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775bf71b7c8---guxamodajupofikijar.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f4006f26---33768123326.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3114b000c---94011457550.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085325b8c3d1---xejowamiketur.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160885ef53b1ee---28775373184.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde1feaf27---zariwenabesawabedefona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=abecedario+completo+para+ni%25C3%25B1os+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_off0000dbae.bin
460dc39f3eb5f78d1f7bf71aae59ce7ead27b32d6b7e45597e17be3be9544e63
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 5640 bytes
font_01_sfnt_off0000ee7f.bin
d9ebd6cceb6226abc587dc44fcea6547fbff4f966ec34db0bdf1c15a8e86c332
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 11664 bytes