Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc0c311ab93b713…

MALICIOUS

PDF

82.4 KB Created: 2021-08-20 07:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d002e6caee632e40a7f7abb537bdd30 SHA-1: ea0585998b2a1d9d505d589752114c49bc3e4f1e SHA-256: acc0c311ab93b7138416dcd37c25674040bc8fbb48e9aa1f08e9997d7aa86db6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and URL patterns are consistent with known techniques for distributing malicious payloads.

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 https://crewmak.ru/uplcv?utm_term=pal+pal+dil+ke+paas+mp3+ringtone+download+wajah+tum+ho PDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbaff0d34---3289722091.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9426b104---takazatimunejuwopu.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/gopunevukeralivirisov.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e9bcee95---zoxikafulitowakifaxale.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1067a4af508d450d9626a793e62fe067/pasefotitofejumoxipope.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/lewatolipuwumedegiv.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/mutaxubifirupevumuga.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d85985e0fe---45356937875.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/letusosaripedujidotofitap.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9118c932f.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d3460ffff3d2393cb24f5838c361690e/walazemito.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbe817f7dd---waxowegufotagaga.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/818099825.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea13dc9b8---ximazolelefanokakoviz.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aae00ea57a3---96110534752.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/1ae74a08e640ad0df18232403992f76f/38630353936.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zimagukadesawubat.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/rorimijilanego.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607180e863316---doxinemonupese.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/gbgm479b75ovdttsuij634qmt2/nafaxedipudesumevekagisux.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f85ebebae---36435055383.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/rasepub.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/nutemudexeguget.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d96c7c482---volemubifam.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/43298067790.pdfIn 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://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_off0000d517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 11420 bytes
SHA-256: 2fe23bba859cf52e0e9a9c5bb27e8526ca3003e87ec633f00c3d63c6eec2be0f
font_02_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 20284 bytes
SHA-256: 3d81256ab044da6ea3f21fca466eceb804644135df2d70af436ac20f7c82ee61

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