Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44af5cc90f04e35…

MALICIOUS

PDF

73.0 KB Created: 2021-06-28 21:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c699b17dc174dda30453a45e4503cc94 SHA-1: c721c2ab04e066abb7bcd4bf0f593add0f79d7f4 SHA-256: e44af5cc90f04e35eee2959426794606b24c67e0fab67e49d1fdfa1597b3b6e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/fc1e38482110cb310fdb8fe4c20e009d/61340329896.pdf
    • http://poorclarescork.ie/images/28407613699.pdf
    • https://vestol.bg/files/file/mitogusimidajapob.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075e848e8a15---29575322670.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ure84ejhvdbv2kl3plg63j7rf2/buketudirazesem.pdf
    • https://medtek.vn/storage/file/valabo.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/kf3iafqt4n9kp6qos211i9pal6/98651307465.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd66c17d96---94413614554.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b392bba7852bbc335b2641c2b13e75b0/bonolifujabexisisosazamek.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099e6d6c148f---18512978831.pdf
    • http://cuacuonanbinh.com/userfiles/file/57484554429.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a74d78b45f5---26495897559.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e9b5c8e8---26979548771.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ef8a876f---joselewapad.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/72e1924ead6bbd35f639b01c22eee297/tifufom.pdf
    • http://limoride.net/gallery/file/24085201297.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/70440a68493eadca8d415e25ceca818c/japaripoduzuduxamurox.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce9552d0d---dirurevufogas.pdf
    • http://girl0229960192.com/upload/users/files/sesajebelaxu.pdf
    • http://relatives-united.com/clients/75139/File/19461742550.pdf
    • https://adreshosting.com/calisma2/files/uploads/bepemori.pdf
    • http://guyfamilyreunion.com/clients/41950/File/nimijivo.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/f5d53ae59779a8b6fa215471bdf64204/mazivexeganejerugodanagox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mature+moms+free+pictures
    • 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_off0000beb7.bin
6a92bbb4cc612e4fb0bb0208550e7e2edb4159d497f324c2d5173de86a8b942e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB7 15624 bytes
font_01_sfnt_off0000e6a6.bin
1ea3049a1b32e45e10da1918c91dcb8bd82b521c45b5052a215d9dcb85a36db3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 10584 bytes
font_02_sfnt_off0000fee9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 16792 bytes