Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ace59b56bfeab9…

MALICIOUS

PDF

94.9 KB Created: 2021-07-06 08:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a75965cce757e5cb110360969a924749 SHA-1: 46174fccbfe9b576bc9d2d7d75a60c2deedbbb7d SHA-256: 23ace59b56bfeab9c433978da2b0ba4a2f849662108cf6c999e9c0de82d933ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate the document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs hosted on these compromised sites reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/phlrhdtl00gd7nlo4hjkclr9d5/tusinewa.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/2lsakv87hrpl1vcok6lldsl7lb/30868115924.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/72831675458.pdf
    • http://hakkabrothers.com/userfiles/file///97917265471.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/61147381982.pdf
    • http://nsfeed.com/_UploadFile/Images/file/70737341739.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/o19jv3jsfbclbsb51dj4arrlcd/40413998463.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/lezamononipug.pdf
    • http://shannonlakeestates.org/fck_images/file/jaxegalulovuzuzejogoxukaz.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/9tg0dgc534ip85j3i9j0t9qs96/gizemisimamoladotenamezam.pdf
    • http://grupophi.es/uploads/files/93390090059.pdf
    • http://supermarketdv.ru/files/file/50940576449.pdf
    • https://digireg.gr/upload/98215319199.pdf
    • http://szentdorottyapatika.hu/files/28409433295.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f72707928c017c11073ed32ea289cf36/toraluborerulitag.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7710kd50b4gibd45tf7j76qrg4/77932791788.pdf
    • http://zetrade.cz/userfiles/file/93444929243.pdf
    • http://daoltrading.com/userData/board/file/42103071046.pdf
    • http://podlahypilat.cz/admin/file/furepag.pdf
    • http://entiambalaj.com/upload/file/fiwajosu.pdf
    • https://b2cexpressdemo.com/userfiles/file/jugipuxuvoxazaj.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/kifixarunetuzoxevumi.pdf
    • http://dlikefulproductions.com/clients/875850/File/natitonu.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7765818c3dbb488ad3ca79c208044d50/kofegonilekera.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28bfd13c4---22815515362.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f117397b---37748159922.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=elude+meaning+in+telugu
    • 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
stream_002_off0000efe9.bin
a394a1657d2fcade66344875041e52a38218a4c2fb9163671d86e7a14e00f415
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEFE9 18616 bytes
font_01_sfnt_off00010da3.bin
c1f5f63c6601d8d9733bb3181fc726a1e9412ef92289ede53b67e7195c109a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 10284 bytes
font_02_sfnt_off00012474.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 16792 bytes
font_03_sfnt_off00013c86.bin
bf3abb478616efe61f7de2f48ee231a9c99f441ebf85ea69cf81567864fc4cae
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C86 18984 bytes