Malicious PDF — malware analysis report

Static analysis result for SHA-256 07dbb9a388c8a25c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 12:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e28d61e2f0b4c5bebe382ff87a2ca897 SHA-1: 4de15cfa4d33073656be5b7cee68f9be16656293 SHA-256: 07dbb9a388c8a25c53a2c63ff4739ca485ceb000a7ff0cddae2785f279e81d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d1f47c2bb---defebafixubasilefaviso.pdf In PDF document text
    • https://tepihtrava.rs//files/79843600601.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/68966238569.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608daa960c234---82990024197.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/rimisefagenitevapod.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/juremenowoxufegudizoz.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/lomajemikukufi.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/40571712035.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16123ba41793b7---bekuvenewemegobome.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/46686782858.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/70411dc068518467c66c4fafe27e0982/52026734540.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/lejunidofakuj.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dff02484f---86575829923.pdfIn PDF document text
    • http://weingut-suppan.at/files/nodisavalukaxifo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/r7sqcfrgice49opka8p79chh30/18819497343.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/lodid.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/bakek.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/12gihvsas79aodm0ep2t4ddj0d/57335440795.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/tujofim.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/bufaresiw.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/95591f31a0302f7d2e1acf5258351297/11634303387.pdfIn PDF document text
    • http://progetec.org/userfiles/files/22615379065.pdfIn PDF document text
    • http://siembra.me/uploads/files/misenimovofi.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/35904727641.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lcraglvdem2esa4ofq1hqnmnu6/90913626055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vertically+opposite+angles+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 18660 bytes
SHA-256: cb8aece7883529f497dec701b51b58672dcd87db1d06e0c4c76ae66175f5cf28
font_01_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 10880 bytes
SHA-256: 452e255d7121ae5a708924cbe70456da812ec62e8e7e143fd8be9bb35cf4c4bf
font_02_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1