Malicious PDF — malware analysis report

Static analysis result for SHA-256 912665a829cd3952…

MALICIOUS

PDF

93.0 KB Created: 2021-06-29 22:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a8daedec20f7d7f3bf5a3cff56abed4 SHA-1: d65791432334abd89af5889f647881ba34380a9f SHA-256: 912665a829cd39528602eee349ba64174c297996fe6a610217c02145b441b6f7
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/e985a427882b3b53b737cb58795298a1/fifosozalovemorawikujixod.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3bf68b6b---32967060640.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v8q6evs1l7d46a6fu8o9f1bih4/8116237067.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/88789146137.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acf25d0e910---2045957684.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2hkm0qr6ftalsn3i27tpt8cnv7/fuzog.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a4e322f1bb2e2050d37d8fc4a58917f9/43858827142.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a9a1ef58---72232938418.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4707eb90b3---bemilixivepezufamageg.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da40500b30---62955903332.pdf
    • http://www.gamylai.vn/uploads/files/76065348202.pdf
    • http://humanitool.ru/userfiles/file/76850246466.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083732842bdc---rolowek.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a223ff48f66---9708868086.pdf
    • http://kccmaul.com/files/files/72881899430.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/834e6e1a93629115ab25cf3091762f2c/jopasedaden.pdf
    • http://doks-films.com/pcms/content/file/89693275441.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a243b920009---1008418018.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/f55cdc5c398b68971d9393a672c1ec6a/53961104072.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0e201ed4ad3562ee766f34aa09b486e0/53963877670.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51b5dc3aa---93542398436.pdf
    • http://handbook.hu/upload/page/file/94592143249.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4473d0073---9918368068.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2bdd529c0ab1d10125f009cc32b3bb20/14278736391.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+tv+9+pie+iso
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f004.bin
9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40
pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 16236 bytes
font_01_sfnt_off0001059a.bin
300f7be72fb288a093a2b9b43cdeeba5fdb4b74a58aeb25c19a02673f1324cef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 19116 bytes
font_02_sfnt_off0001368a.bin
205cfdf661893617f56981df0e4596ccda94ded647bcbda02827d51ec70d677c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 10392 bytes
font_03_sfnt_off00014e39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E39 16792 bytes