Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3c68860d932867…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 16:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b2a053717d3cffcec714b038f977a59 SHA-1: 2a7c3c28230706dd06f53229d0f09de3ac3eb031 SHA-256: 7a3c68860d93286720e27e458497719d09e534d57d3d52bceba3acab9b3d8230
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e0da049d---dirugukox.pdf In PDF document text
    • http://dzirerealtors.com/uploads/somoxamikizovelamufet.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2bae4631---55410348587.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a6ab6b8acd.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/wugivefukunutedimiruk.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/99494814075.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/lofisipop.pdfIn PDF document text
    • http://prompol.com/media/file/xafibutegupa.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/362f2dcbab67e0ba8809fb8ab0ef763b/vujejoxutubewagemad.pdfIn PDF document text
    • https://egca.fr/userfiles/file/xusavipasosalelilir.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/75863277763.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/tadabasoduz.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/53588514348.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/94578759335.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/xobaxaxiziwubutilujixe.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/88395963565.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/6361429885.pdfIn PDF document text
    • http://apart1day.ru/file/terilijasarupitofojoj.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/fekunonisudubepezewitew.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/degiru.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/rizivifuwetobon.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/dakogutefaxiraxefe.pdfIn PDF document text
    • https://oferta.lt/i/File/12423687942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=keyword+difficulty+checker+seoPDF 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_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 18060 bytes
SHA-256: b0207deb2c6c282c6053305ab306cea847635f17260818f9f0d65b384a5444dd
font_01_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 10692 bytes
SHA-256: b0cc9be841289052cf95d384bfd635ee08c685f987c533c962fe8a85f681d4be
font_02_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1