Malicious PDF — malware analysis report

Static analysis result for SHA-256 313f84ee2c2ac9b1…

MALICIOUS

PDF

74.8 KB Created: 2021-06-24 23:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cce5907fbac7417a8142511500ac31b7 SHA-1: 1bf6ad1014272982757d52efd76f18e0f7957b89 SHA-256: 313f84ee2c2ac9b1a51b2b58d60c46dc3a3adcd8fc52461f7a75d7351d588a1d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to contain metadata rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=inochi+no+namae+violin+sheet+music PDF link annotation
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/blgjoje12g3pag3m0h1s0qleob/sowexadejiguvi.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/13486376421.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab796e0b72---tutowikisoboduge.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2900318549---82784765096.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/u8dc5ociq58ppr2ea2hcob0lbt/87072895815.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/42454187358.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f9d4559d---69965954069.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/202mtlvr4l95ngilic5qhci0gh/47458255260.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/ferodaxe.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607309594ea69---2020109447.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609100db97566---41022347657.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/mavixofawipumiru.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/61eae5cec7b92d51637538fe4bbe1175/83021403256.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/zinafupuxovakuvewisumij.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/lofefojeparuwosu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 7560 bytes
SHA-256: 834e4a8f5f164537d45fd21e2c994e9c77150b7b19b43615c38345d3c062f6a4
font_01_sfnt_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 4940 bytes
SHA-256: 8f21879447c719bfe9d1310655299fa0be79540207942bf5e773495f0925bfa0
font_02_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 11388 bytes
SHA-256: b7b1864056ba3438be4fd672a9ebbe7759401655951d44e5b4162f33986bcacf