Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db2beb92cb9de49…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 19:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c640b34d7c24561894b96b3142ef6017 SHA-1: d81f2d29c741f5cf2ef0c89ea734af8ae82de052 SHA-256: 2db2beb92cb9de49089772ea3bfb6b38c0ed6545689f029f3cbd25c22245e1a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://24cvety.ru/upload/files/49723098780.pdf
    • http://www.radio-kum.si/data/files/kejoperanuraniwuz.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1622d352517fcb4bd75a6329dbfc7df7/xinuwuvatelosabuduf.pdf
    • http://amsasecretariat.fr/userfiles/file/sudapamuzovasarezimufa.pdf
    • http://fixafilm.se/userfiles/file/toposufiluf.pdf
    • http://altronic.pl/!mag2011/userfiles/file/gejilo.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/52508499974.pdf
    • https://eyetracking.pl/userfiles/file/zexamawa.pdf
    • http://logtech.cz/foto/Image/file/80626610992.pdf
    • http://hongshengfish.com/uploadfiles/2021092022543787219.pdf
    • http://bookblog.kr/data/file/files/99447879556.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a099617767440edbfc9af177d694b2b8/jupal.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee89c5704---dikidaramaxine.pdf
    • http://decorstore.eu/upload/file/59207181658.pdf
    • http://villacappuccina.com/userfiles/files/wozarixaxevebefugofufi.pdf
    • http://capesociety.ca/uploads/files/26026348803.pdf
    • http://pereplanirovkaoblast.ru/pict/file/gobeli.pdf
    • http://energyexcess.com/userfiles/file/morejofefowojidosexenuz.pdf
    • http://bsbcarpet.com/userfiles/file/24440518633.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/86992633695.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25d213471232d1f709da651d81b7d7c0/mozirixokawarubu.pdf
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/42603413613.pdf
    • http://yuhongzg.com/d/files/43207049102.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/af3f7aa5331350e916c9c7aa83049946/zodolewiwewikanolupazer.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=send+your+resume+at
    • 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_off0000e568.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 16792 bytes
font_01_sfnt_off0000fd7a.bin
24c7fb8b1b959424c7f0a8c5797270dfd3a250b524ce5ee5b071464a1e2762d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 18168 bytes
font_02_sfnt_off00012c14.bin
69d42ff3a91808afcb330503c68d4b8c2abfbaae911285f07db6d2b6a77b7849
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 10560 bytes