Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0762e3a1a55874…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 21:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80a6538166fabb9d64c797996b8136b5 SHA-1: d2e7cbbc4673de5e4620ee5efd16c6e590bb7d17 SHA-256: 3b0762e3a1a558747469a7a47b0caf74446159c343abf598516d051ce3b89d4d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/ganazelixiwazu.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a7fd95bf---gifuwatuful.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6cbfcf4f8---xavazariminolagaraxuwema.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58e36e302---vafezixugalupepij.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f4d23002---fimaferineluzumanugaraj.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7941a2ae3---jubirogedadifabowo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1frgqb9e75e4023tk705p5s50n/kugikozowa.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/142b6632ed5d1dd4afc0de82a58e1395/73312927686.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6436b2dac---kumasudabek.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/52749340485.pdfIn PDF document text
    • http://esistore.de/userfiles/file/paliniripopawirutegoxatem.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/9b7e00ac6cf03d199b71986fa4b865d2/53647920196.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/gatasoguzojetipuwezurazi.pdfIn PDF document text
    • http://matras-devison.com/upload/file/noseluvawuwufi.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/44383435934.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160960aed84b5c---jufesunulasupoxebaxelan.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/murinenexusazod.pdfIn PDF document text
    • https://music-group-store.com/upload/files/jurejenofibupanipu.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/16479058504.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d717ba4d6ac18075d543f85e7899f7d3/dezimerifuletupofi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3d1c6131---59449989728.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0bb5e2454aa399526d5031ab3e984507/pagutamojaxevigixalefoki.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a732044bc5c---redij.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5401a90ca7---gemaluxefomakogowe.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/16490104239.pdfIn PDF document text
    • https://peterdegendt.be/file/ligepalukulas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=rend+collective+rescuer+chords+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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 10768 bytes
SHA-256: a0805f26ecc036c0f7818bab8718c9d1979cb99e8b589599717bdab0b2d67d9a
font_01_sfnt_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 17436 bytes
SHA-256: e5fe12ad1970315fb84a95c47536cce0fd7709ba7336cb9db5cec099217dda73
font_02_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1