Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce34e4f367fcdb13…

MALICIOUS

PDF

72.9 KB Created: 2021-06-27 22:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a4a9ce686ddf4a553051876d67105b5 SHA-1: 2eaec4bbf2cb56fc157fa63d92fcf1c7a5dc15e9 SHA-256: ce34e4f367fcdb1314ababdb1248b47d361111a5fcadcf3ca6c3af5f30f06224
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13776d4987---mufudapuritonuzobivef.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a819818da5---pulunutojiruni.pdf
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/d560e638735f83b2f672b2bdc2327c4f/91701441456.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b213038aa81---19455008000.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ba407fd76a2---mogagologusupokiraxos.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7775abb68f---76216863784.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/rheg4eamnpj2crjtdc50sdgku4/12822922579.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/c2b7170d5b6422ce92b7114bd2b89f93/53277692721.pdf
    • http://xiaohecollege.com/d/files/bukewepiborejubewonole.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/6161bfd6dba3c4155b0062a30ce3bc87/99595242166.pdf
    • http://mindentudor.hu/userfiles/file/20369167404.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/28f29f5946a9879157be4a75e3957caa/59762278761.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e4185d283---82142173153.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca573c13f5---71364690725.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4acmsa98kuj43d7lb8d4dfliam/mosijuruvafifit.pdf
    • http://arci-mp.fr/admin/File/kirefubotaw.pdf
    • https://actorconseil.com/files/file/89026250741.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/472f8cfe741aa30f38677a3ccba069bf/fitaliweris.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16078114e91fe2---59007743482.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/859fa634ecee5cd53c0efa212a3b616f/funigewuz.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/25095848964.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=made+a+sound+like+a+cow+crossword
    • 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_off0000bb6e.bin
986e14fe4840d1163ce523b4dbba5821c6affe4636b4dbf50123092470c9300d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6E 16644 bytes
font_01_sfnt_off0000e666.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 16792 bytes
font_02_sfnt_off0000fe7d.bin
33c21b6fceade2054e19a53e441009624edc4dcf729cfdb5b5ae58947b0bf514
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10536 bytes