Malicious PDF — malware analysis report

Static analysis result for SHA-256 6897c842c37d8f11…

MALICIOUS

PDF

83.3 KB Created: 2021-06-30 21:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc3cdf34e3cb43b92129ee13ad77e723 SHA-1: 7c4052cc7c95254c98945f3b72bb9f39ad287592 SHA-256: 6897c842c37d8f11e2b257cb7fee93c2d01309dacb0184c2d800eded88336996
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly show a pattern of redirecting users to external, potentially compromised, domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2qdmuk0ar2aqikr227c829vg1t/82972703222.pdf
    • http://www.deco-interieure.com/userfiles/file/nisedofikalatowowat.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/597c299c0ef116d4176cd1dd7d534ce4/84130516376.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ep461nrgj5683tqhvtt8s67pe2/zaxixiseb.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d60f9c497---xowivatemubosukesuvolad.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/89072398330.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608558b1e27c0---tosomevilovepesuwuxogibu.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/35976c3d7eeddf2deb35c3c55621d7ef/70206323887.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/69521563930.pdf
    • https://cdmsig1.com/ckfinder/userfiles/files/majowufilufune.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/79b8c1011486bc8b5282104477c0ec5a/78076273561.pdf
    • http://bioscipublisher.com/files/upfiles/file/59322372952.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587c1149fc---76840965145.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5c0ab2065ab971dc7cb2e3a711c4fbee/fafekebimomafedanevigal.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6d679b9c8aa99546d76396df12b5387f/jifulexisutigo.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/3av11uaanttgudvp267pahrvsr/4755620897.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/76955907826.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717941552e8---98258942550.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d87e91fb3---wovefexitobufasiw.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16091664cb7bb9---gadonugijarenifemujuxu.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e0b3c0bbf049ec97da4e2d0c850e5b6a/wilebevimosoxiga.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8vmh3nqu4hqrq60mti71ei3kfc/87467404002.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o9j3c9t2hfnjqkgedqhk4mb2i6/32575301094.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mexican+peso+to+eur
    • 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_off0000e332.bin
de0afe5896c4fbb272e88b1783db105b7f822e43583d59f58f8a5f41f721a810		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 10516 bytes
font_01_sfnt_off0000fb54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 16792 bytes
font_02_sfnt_off00011366.bin
c979eafdc680630e45736cf99b79c6f72e09f0885b16f6b736f5667b378f761f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 17148 bytes

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