Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a744fa63c82bd8…

MALICIOUS

PDF

88.4 KB Created: 2021-07-09 15:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d32283e80f188fbc198cec9a5f5d8d9 SHA-1: 4edaef781068bee6064136a73d5a01b0a21f6eed SHA-256: 25a744fa63c82bd822bfc7d3b42d3c94c4ff23aecf7bbac58dd858f41dcac49c
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this is a malicious link distribution mechanism. The document body is unreadable, but the structure and heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/mupozegavimebuveta.pdf In PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/1783423612.pdfIn PDF document text
    • http://24cvety.ru/upload/files/29308461363.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f5bcbf6ec27b9d480b6b479e2872ab8f/22789079892.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/jp3j1ol5ct757r1lgg2slvk233/66715577109.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/9002499185.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6860b0eb4---20740591960.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a984cdbb0f9---nipozugulamixigajivota.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/d9m0bm5mg2ib5cb7ce51hmhsf0/46228499230.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/soridelojurobatoniwevid.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c49407c458b---dovaxabirope.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/gavalebalagivifasiwapu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bap3vriih52k6rr034hlm39tho/guwikerurigatojirelap.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607296de6f37c---77608221237.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf32a95507---mekozovote.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815ddbcf7c3---92356727982.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d2d57b7c2ae2f0287c5f6a2f66767d68/sudipakubokukox.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/nifololo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a715163b384---mubozupofuvaxuvatiwotu.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/44754443430.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5d2bb2870d90f8cfbdbe90151c47f41d/38516287151.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/99521669649.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/abb4af06f68db3b8376787c3165b8296/77215332676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=if+you+were+baptized+as+a+babyPDF 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_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 16924 bytes
SHA-256: d3a22d12b2a11ac179b43ec6decab15e4c3cc5f53c2adbdeac2d8dc019ce9d13
font_01_sfnt_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B94 10792 bytes
SHA-256: 062ae707f99fba5c1a6f8b9aaa63a4a991acff3501dc2c8b0a5e7b822cc21aba

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