Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3b9006cf1d2f6f…

MALICIOUS

PDF

87.8 KB Created: 2021-08-11 14:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee411d58a47434c0d415b0d4b13402bb SHA-1: 28d98b1447926152bb0462f937c1adc50755538b SHA-256: fc3b9006cf1d2f6fc1f33195b5baa75869f96663ea7f1df691cbcbe12a37b782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9630b718cd1973df13f29d22d3778458/40599855831.pdf
    • http://szentimresiklos.hu/upload/file/tabedebexebotajozo.pdf
    • https://acryl-bg.com/userfiles/file/gupel.pdf
    • https://soechi.net/userfiles/file/vesuze.pdf
    • https://watertorens.nluserfiles/file/64741528485.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1ec68c41---51605340364.pdf
    • https://foulardfotografando.it/file/7569458934.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071547d38c23---netos.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/41737771890.pdf
    • http://studiosantese.eu/userfiles/files/20642119836.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4039ab827e4172588ed2dd0f8562307b/puriv.pdf
    • https://jxlmedu.com/file/files/20210727_074129.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160849deaa82aa---96153708586.pdf
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/godimabifufizotube.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mga5cdjql0b2vpivq0kbadha2e/32278444040.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/62181014705.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df521d23548---66403278503.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a023f80fcf2---24379579811.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083e13220d9d---dofefob.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160faa9becf810---60304375746.pdf
    • http://paoladebenedetti.eu/userfiles/files/40182500405.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089595bc2165---86870281794.pdf
    • https://iamtimeshare.com/userfiles/file/kaxeropo.pdf
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/72328763335.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ejemplos+del+presente+perfecto+en+afirmativo+negativo+e+interrogativo
    • 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_off0000eeb8.bin
07f98b44b03a62bbdd6fc69773fb256d0d8d3588bbbd156b50535345f858828b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 18168 bytes
font_01_sfnt_off00011cfd.bin
6ae578f6f43b2046995207bc55a460b4cf12f3ee356632c2bfbd03d241508746
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 11144 bytes
font_02_sfnt_off000136ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136CA 16792 bytes