Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ebc16752078543…

MALICIOUS

PDF

92.6 KB Created: 2021-06-26 01:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a0581c6ee9386e11ba366f59cd11ba7 SHA-1: 621cce184aca3a5402b708c185807364a29e3ae4 SHA-256: 39ebc167520785438ffcb82c29d5658d49b7a8d3071118a6035feb5cf8d6bb24
164 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, indicating a high likelihood of malicious intent. The file contains numerous links to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content or downloads. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=neet+most+wanted+book+pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9d76d5d26cd43c7b1038a391d08771b4/48609983344.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc1ec897b---mujojesi.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4e7d0c252c89fed4db49a67027e82a74/vusesurifajisenalolexog.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/94410963280.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160807b0b704bd---27242397519.pdf
    • http://ekotronic.eu/files/file/momuxi.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/sdsjoejg66noo3u8gum1us75o6/nimofoxi.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/442fa4d7324c6553794c7b39b8c0e1a3/17302262804.pdf
    • https://ratco-hardware.com/Ups/files/1600390449.pdf
    • http://thrifty-uy.com/files/others/15057463110.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/98b9ace0f30aa9096887cff2a26b2d66/fojet.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e788b54756---zamifuvedibaga.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/af5a80797b79bd8aa522419a9226818c/sasoterodukowirolelo.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/6diahenr179n6q9mfq53pbti3u/72106422709.pdf
    • http://smclassof57.org/clients/34860/File/72413769856.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2684f73b63f7951a83414275742da7b8/mutafabodebigijedaximos.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607114997d2e5---fademipidekobosil.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7e895d61f1451307161e484e68adf0e3/63334746679.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bb49ade3bd8a83789d11ce92ef657e0/59492338243.pdf
    • http://dkyangmei.com/uploadfile/file/2021062319203073499.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/bmui2n635k7i2o66qgmjualos1/90321017526.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f74750e74---65997325175.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/69634971854.pdf
    • http://elskenecologie.nl/files/teputuwefax.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://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_off000100d2.bin
58d518101c14cc6e9cb2d01d63f6231c63b629bf97b75d2d550f792f8ffc613f
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 18812 bytes
font_01_sfnt_off000132db.bin
84612aee4613f8e1e94d23239b317f0386a2cb283cbdb605f32bb69bcf2a6a72
pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 10716 bytes
font_02_sfnt_off00014b5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5C 16792 bytes