Malicious PDF — malware analysis report

Static analysis result for SHA-256 7471202c36df4be4…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 05:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 874a545f397d2d15d93fafb1b4c6edb7 SHA-1: d72b50c8867b8a8b62e12f33e116f348e65a6109 SHA-256: 7471202c36df4be4d7609aea240703e3424f80f89d6da40b70c8e8dd132ce477
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queensflower.nl/clientfiles/25588771744.pdf In PDF document text
    • http://zonazero.es/userfiles/file/87334593256.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/kamexuwezurapagumevoladi.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/80021262124.pdfIn PDF document text
    • http://teraval.cz/res/file/manunevo.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/15551954678.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/raramusutasosedagijizivid.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c34e00591ca55e43386e751ee1218ee8/11897197538.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4764c1aec009aa0b7d5df99a011ac4da/53012864666.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/pamemiruta.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e90094a79---sasolenesodugawevi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/510de10cf655be46a60e719944bc9de6/74824506378.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d06569e298ffa6cf17f469ec0f136db3/94093266966.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/19cf0f06533db97ef9163e9177c91bc2/kawubexusemidaluju.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b7191eae299ab59422220029fdbabc16/90708243423.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/jemuvofaxar.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/3kl8qj0sbtdf4db0ragaefs984/46366305402.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160925cfe10a37---40498213118.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094667095c71---90337267405.pdfIn PDF document text
    • https://people11people.com/uploads/File/zedisamutogutitogudewobok.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vei86lb4bqp1mv9ogl4e07g22f/tezukexaxexaxaz.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ec80649eb---desujamelunokonovirebab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=subtracting+fractions+with+like+denominators+worksheet+pdfPDF 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_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 11560 bytes
SHA-256: 1eb91f212f87093ced67a413a5e442abd132346039efd8c7b76efe1d2d7cf09a
font_01_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 17656 bytes
SHA-256: d4e8c4ea6ce5cdffab82f68bd16676213637cd9c927ea6adaddf4b07be29f297
font_02_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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