Malicious PDF — malware analysis report

Static analysis result for SHA-256 78db81e315af3c6a…

MALICIOUS

PDF

91.6 KB Created: 2021-07-06 23:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33d7abe94df3b0e62e804219333e8744 SHA-1: 1c38084e2d2d47b56e7662e025e239f24e3ab329 SHA-256: 78db81e315af3c6a8d2be34a3f48fc4b445d62d25a6a2a86edf69091ace7f740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/254e76e5efe244a7119bf444173aa2ab/rozipiboxiwavurukizi.pdf
    • http://szpk.hu/_user/file/47394852689.pdf
    • http://dhs1959reunion.com/clients/871764/File/jubaj.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/20688665856.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/98312348832.pdf
    • https://bestrecycledautoparts.net/images_i/file/6497463597.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160702e0b64b4b---rufujav.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/2586a25f95e695002018d872f24ab9a4/56088921566.pdf
    • https://by-express.com/upfiles/editor/files/dakukevodar.pdf
    • https://dienlanhhonganh.com/images/pic/file/26838036744.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c97daaebfb---majabokalibaf.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/zosejojonevevos.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/j999g3fc41qvli92r6keab6gm1/bawekalodamil.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d26fb25bf---33818911234.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2fa57e51a---61809736433.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d9nv6rnun53pnkm971e1r9b241/95982276086.pdf
    • http://fouladsazanco.com/Upload/file/dolejolewom.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160779a62837ee---63123553065.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f8ada6af---kixap.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d419278b8bba5933411574e2475850b5/nadijavamege.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ced7a19e7---jupelisujofegexod.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/27e89155cf09d2b39a9b9734dfda7b20/wewoz.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c0f1784e---ximorolubizajakekigasodan.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99036d40d5---jomagekazase.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=san+benito+saint+meaning
    • 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_off0001027d.bin
9843db7a75a818f3c1c857c49c062e587862c37b4e5ba423847f5c3a675c1277
pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 10520 bytes
font_01_sfnt_off00011a7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
font_02_sfnt_off0001328d.bin
30dbfd39f55ab84efa8a8b2d9af538d2163e856647d9e664405895f30879c718
pdf-font-stream PDF embedded font (sfnt) at offset 0x1328D 18544 bytes