Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc63bb501a944ee5…

MALICIOUS

PDF

99.6 KB Created: 2021-07-06 23:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 114375512ffbcc22ffbc653c7df05a78 SHA-1: b87e4c936c266e8f97038bb9770b44a3a8a5f2f3 SHA-256: dc63bb501a944ee524a74ca3afcf5844145ef7d07cd0897f8c985d3cdecfa2cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous links to potentially compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing attempt designed to trick users into initiating contact via phone.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://unique.global/wp-content/plugins/super-forms/uploads/php/files/e915f1e28ace6754a784f93c492eb120/71465004841.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608647041bb13---23473590119.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc0cf6c94f28f5b0cba65e13eb7462ca/8539813291.pdf
    • http://jtylek.pl/Upload/file/dezifawez.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830f5ae390b---10325196576.pdf
    • https://abugfreemind.com/userfiles/file/vopusu.pdf
    • https://agrilaui.com/userfiles/file/xefaritunikefasumize.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/jelimeva.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace4fc42a28---ronajekima.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/h36b9qeudra2lviq0m6p8fi8t3/lomotava.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160823df90a6f2---jekidatiri.pdf
    • https://anitacalderon.com/ckfinder/userfiles/files/62353197956.pdf
    • https://aldurra.ly/images-editeur/img/file/wilukegawuvanotija.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bff8d1bf6---fiviw.pdf
    • http://sys-svinding.dk/userfiles/file/jotupuwobejibakeja.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/880f414b8e29d1da77b357cb1f6f25b8/gafodabu.pdf
    • http://schokoladenfontaene.de/idata/bizidutipesatawanajukivaz.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078820ec7116---50036074171.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/xesuxu.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a45d88b5a0e---74098830471.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b8d4cea9effc6d17993b990bae2f15d7/dipupitutenebitivuvonivit.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/traudle4uh0a1ic57t0ge31f00/maxegotafavi.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c64768851---sokinowa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=out+of+africa+zoo
    • 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_off000120da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 16792 bytes
font_01_sfnt_off000138ec.bin
c7c7ff5a0d3171105d25d21ffa7177c31267fab9ca221db700ec5dc26dda76bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 18236 bytes
font_02_sfnt_off00016973.bin
b8f4a49e0709afc588bd3d8efa8f5aabbb823b88557acc2387c33688ddd388a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16973 10064 bytes