Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd4dc5599ceee5f…

MALICIOUS

PDF

88.9 KB Created: 2021-08-12 19:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 846ad9ad580fc3295a5f921abf2cf38f SHA-1: 53b737bacd6c9ad6734a230edfa3cc66abb92cf0 SHA-256: fbd4dc5599ceee5f00eabec209f710f82340106c18776d24121db9f74fa6c96e
196 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.ecvbrass.ch/user/web/file/zotoxutefena.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/32903580187.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/lojujawivutevowipug.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/d07bls8ms9tr86dso1s403doq4/21280206467.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/2073158277.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/97346140176.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25cb125bba---77027101749.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c7f950cj1h4t355nnsd9q6vns1/wezowitafujetadozebotakuv.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/nudapoz.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/81898856210.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/pimatedejotuxo.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zuxumejabapijeg.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/81750284549.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/rinobunonisiboxi.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/xizigidakanifodelivewu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079499e3d672---neregigo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7713f47c54---25809974358.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210623151243.pdfIn PDF document text
    • http://nova-auto.com/upload/45460739247.pdfIn PDF document text
    • http://dgjst.com/upfile/file/62589320631.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/08047b63d25f3ead32d95dcc723a60a0/79553922400.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160929ce694326---sidelowikuvuxazinopa.pdfIn PDF document text
    • https://marosme.ro/hirek/file/wuwel.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a98b1040d87f6f09a6b69d36adcc007b/ruxezamuninixisonazad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+receive+money+worldremitPDF 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_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 17608 bytes
SHA-256: 3f29f6a66fbecc8edf0c92ca6efeba0d43923e0a6d13edcb8399b9d486a3faa9
font_01_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 10460 bytes
SHA-256: 075b0bf5eedbad0d924e2db7e8beb2528b84e3feb11f727f3d73148c626c3878
font_02_sfnt_off00013d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1