Malicious PDF — malware analysis report

Static analysis result for SHA-256 da61602066eff54b…

MALICIOUS

PDF

94.9 KB Created: 2021-07-20 19:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4838f6e6cf67ac78f0337f3b26baa985 SHA-1: 519988406a51488f6fc6521773b0ad6045b43224 SHA-256: da61602066eff54b210e3c1b41f7a6451c8c55566e60999ee1b8f61f3a96524a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62c166401a---simitefogilogatiduzesiri.pdf
    • http://intergeored.com/upload/File/kidogisukaj.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6384aa95---fusedaf.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/d21455827101b53b1b5194a3e14b6721/zovanemibaxuvagonaxur.pdf
    • https://sonntag-immobilien.lu/userfiles/files/91611383443.pdf
    • https://srmhospitalities.com/images/bulk_images/files/jujejazemurexifow.pdf
    • http://finpacecuador.com/userfiles/file/95984011098.pdf
    • http://nextgt.eu/uploads/file/17566938604.pdf
    • http://whalesart.com/uploadfile/file///2021060117535526.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/u6d1hkahretapkhblkrr3jla26/kegezetatoket.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0316ee7f2---xiweka.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608561e96852d---96360269288.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab161e719---bivimabezirizidilase.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/21f17307cf69b953ce6eccdcfd44326c/6580839694.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03e3b5c3b---povedix.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/p10qnc5std4h3tr3p8lb6p65i6/31247954379.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c99d2d0d30d8312db6f2c514846a1776/20746430966.pdf
    • https://groupunsur1.com/contents//files/nemezerutatetag.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/640b2192b43093b0d96e96eed5c88c2e/jusedidejizadazexugon.pdf
    • http://commsoft.nu/demo/ktb/wsmbilder/files/xurezivodudajatizovala.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d752c07d7dd---lexaxunelewevik.pdf
    • http://jevades.com/aircraft/fckimages/file/zipaferivibezodatodevoras.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=vinegar+chemical+structure
    • 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_off00010954.bin
77dccabd2803fb1beca9233b1bb5b444b8fe7fa7fd07c7a32ab8d744d73a3141
pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 10628 bytes
font_01_sfnt_off00012177.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 16792 bytes
font_02_sfnt_off00013989.bin
d5de2e87567c0086c67bf87823f50e49c59d9c55dbeba8a76e9c426ce9879384
pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 20604 bytes