Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a1fc22f7175130…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 06:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 126023c13db0fa24bba9cc8b31840545 SHA-1: cca252c7ba21b71e7f70c1a0b459ac3ee6dd651e SHA-256: 35a1fc22f7175130bc8d988f993ea56cff744a8d3d519492754822ae1e1a78fc
156 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. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics indicates a pattern of distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/64jmrifcbc1ddcnh925me2tma8/18910246595.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608e781c68ac7---gajevumipatijelaputagu.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/494a01cfa74542e70f96d821c0b450f5/fetaxogogolifegedibapap.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/bnsuf0mdg3a2hb3bmpe9mtaktl/90157042964.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c98e5b380739f22d83eb744015e30308/78399222437.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/pfdgl1gkpf2j5sfvqbmdi6s6b3/juxeriterapubovukazi.pdf
    • http://mondoacquapiscine.com/userfiles/files/kutagasufavesurozas.pdf
    • http://opuspointpartner.com/ckfinder/userfiles/files/22146879576.pdf
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/30385278432.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3e804f397581520d520c02b18ed118ad/babijizipef.pdf
    • https://nnt52.ru/userfiles/file/neroxikududozekaza.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160babdf00d06c---86522191746.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7240cf538b95ac3f52ecbe8be6503188/82962559053.pdf
    • https://lienlacanien.com/img_pages/file/robanidexibavowigoxonunof.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607723a2089ba---fepiboxazipulop.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210730_916AF1856992E47B.pdf
    • http://siblom.ru/files/upload/file/93402850178.pdf
    • http://anhhieu.vn/hinhanh/file/43919699717.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/78443695250.pdf
    • http://jun-travel.com/userfiles/file/wusuvaba.pdf
    • https://myphi.biz/nbloom/fckuploads/file/82722294483.pdf
    • http://ktcz.eu/files/files/dixinunawazijidesejo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=states+of+matter+worksheet+high+school+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_off0000e782.bin
e2a6f1710dc2de38f746baf676c191fa2c9e89db2befc8db29dc20d0a6434a20
pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 17076 bytes
font_01_sfnt_off000113cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 16792 bytes
font_02_sfnt_off00012be2.bin
e8f93152ff8ea743e6ef17c5e8670b7e45a014e322166ee84300472d901dfe30
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 11216 bytes