Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d71c8eaab960ae…

MALICIOUS

PDF

103.2 KB Created: 2021-07-09 12:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6afd3d419de2783b4d6d846cd4656a98 SHA-1: 13913d5124b2a28d6fae67427057ef67e9ccfca0 SHA-256: e5d71c8eaab960aee3fe8f64eaf4e89be949f3dcd99450cead1cc61a956d2610
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=game+of+thrones+season+8+ep+3
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a5852da3---48489326651.pdf
    • https://asiarsolutions.com/userfiles/file/jemofanejajezebive.pdf
    • http://poorclarescork.ie/images/35266790156.pdf
    • https://strategieb2b.com/userfiles/file/12681077565.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a8e1163cc9df12cdbf3e649f59d17fe/buvos.pdf
    • http://rauvuonsach.com/images/uploads/files/11409841166.pdf
    • http://recviem.ru/img/upload/daxujuvunutawixik.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc31cf3e94---52374070396.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/58a806c0b8c10bd2d25bda3ab3936a1e/notalojepuzanejadipizeso.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ffa73978b---ropawadut.pdf
    • https://angelsstaff.com/uploads/file/46512753267.pdf
    • http://cuuhoatudong.com/upload/files/pimid.pdf
    • http://writtenmail.com/upload_images/file/dikazujesevubaz.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6161db57---81508033240.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fd291d9a814f30087493a08ed4444e8b/82730705783.pdf
    • http://mu-rrrc.com/userfiles/file/mijudukafemejijujom.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/kulutijijolexafis.pdf
    • http://jjmcp.jp/userfiles/Image/file/6515094678.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f6a343ad23a23ebaac418b152526ee38/43304745301.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dae1cd51789---petapifakigosobabon.pdf
    • http://alexhoffordphotography.com/temp/files/file/fafezevisazif.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/e6eb15012f6f7dd9e4b85b657d022ac4/nilufadelused.pdf
    • http://www.blueoak.fr/image/file/tifopigulujigute.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jjjmvem8hm3rkkjdfi29nkfrsf/motokokuninigofikoj.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/nigodakujuxurujupo.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_off00012f94.bin
fa35d705f0f92604b3a4f3d76030113fb6d76431e7f1c7f8a5026ed76f91f417
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 17864 bytes
font_01_sfnt_off00015e5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E5F 16792 bytes
font_02_sfnt_off00017676.bin
1d5e974f9125cd138fa65634c8e089d263e88bedce5d3adc56ccd4492adc4b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x17676 10904 bytes