Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd5ff7f7cdf945d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-02 07:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a21e0f553c737fb2c0c9cd1b2e018661 SHA-1: 9ed94202a0b3839979c181fe7f3f62634268dae5 SHA-256: cfd5ff7f7cdf945d1b9dfa1ab96e73e911910f98b2db77a9859e0ef8a982e842
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farm heuristics points to a tactic of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=love+excel+to+pdf PDF link annotation
    • https://thehideawayresortpattaya.com/userfiles/files/43275367702.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b99c865f45211239d29de376b9f67f94/jiguvorefegom.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a5f33965e845de711a331cad6c3875ff/tazudu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/d90p3f62ehvegcv94e1r77lte0/woraledemizuxodukoze.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/18456720021.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082443918162---gabumegogisozusad.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f1992d675---vulaledebixeladazatos.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6muhie6blo9kfo7vti8dnc53ii/janovakutisawilije.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab89a172974---14077645082.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/68043173837.pdfIn PDF document text
    • http://www.polni.si/Images/files/kefetetefefovemubowofax.pdfIn PDF document text
    • http://scpt.it/userfiles/files/zexulififadaxuzijuti.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/wadorifakafojofezewomos.pdfIn PDF document text
    • https://2acontractor.it/images/file/18313307721.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4e55dc015bd1bc22804f27a5cdbd62c6/viwilavomamipeju.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/zimifosu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25fe6e763a---27862464616.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/16845399520.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/zezosipaxux.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160769229cebbc---jejuwofozexajo.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/tapuzema.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/vntof69bjfvngj4jp1mofvb6po/xedusisitevimimeforowomen.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d8ffa553064f4160a0183a151d010b07/92952130603.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7a6ae3a03d5e2f850bd0b0a1dccdfae2/zurevagekit.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/demudiburepiwugudijugi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090a79f330e0---7364974482.pdfIn PDF document text
    • 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_off0000bec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 10112 bytes
SHA-256: 5e87fbb47759353f0ca998db8e5948b642986fa9c6548a9c458d3c35f196c2da
font_02_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 15888 bytes
SHA-256: 82081a5de21efaaee74be0121fb859fdb08b32175002f8a434782d3d13c592d5