Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eb7d1e82ec30b6…

MALICIOUS

PDF

84.0 KB Created: 2021-08-20 18:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e2c966f3dc72278258361da715275af SHA-1: 5c5dd4108022865d1b67273c281902d5a6e39a5a SHA-256: f4eb7d1e82ec30b67ec7155b68940a2a4236b4c3322b47228f5eba519565ff62
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic findings and URL analysis are sufficient to determine its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/954a5df4f793c9deb75c3b0f4e987abe/51963727292.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178ca31c70---rogifagoroburisofezu.pdf
    • https://kildevangen.dk/files/letel.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c5195b2a13fa26521b4785841fad5c83/rodawe.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff00836687---57386519320.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f8933beecf7ccbe6cd8ad68cc998192a/vuzemebovatumotibavexag.pdf
    • http://bajajsports.com/userfiles/file/foxeruvalozujuj.pdf
    • http://evpltravel.com/xv_image/file/14642334243.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210707_B3C7D2DB1B75F6B8.pdf
    • http://pecsimutargygaleria.hu/files/file/nizemivagotonufakurun.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086594c63b60---kexiposedenupibi.pdf
    • https://badeluxe.com/userfiles/files/12541024596.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/0cbc3f18cd2ece436d77c6fe712f18fa/78798435655.pdf
    • http://4seasonstours.in/userfiles/file/17695554778.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095aca343605---7550812427.pdf
    • http://tele-fonika.pl/upload/file/tilorotawetujonapof.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610247dbc9c45---mavomijozemozog.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8nutolvjn90dfej21ivtubelot/6540552163.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83517726e---96014663766.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d45e5656b12---dixofop.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/dt2q70tf4a3k86jhlor9430rpb/sulobibasokag.pdf
    • http://mytaylormadefamilyusa.com/clients/864113/File/guzagewofaxivizujovuzum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bsc+1st+year+maths+notes+solved+exercises+pdf+in+hindi
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6bc8b947ccc60b47733bba5b16266532/6799664614.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e226.bin
484c8802d87680008518da7e6bf481bc774571d4f45972e6feae8134f3a9256e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 11272 bytes
font_01_sfnt_off0000fc93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 16792 bytes
font_02_sfnt_off000114a5.bin
483ff583ff94ccfcac7e109bca10d120fe0dccf4e7c35ef0d602f78cec0d9a08
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 16748 bytes