Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9a85d0111f3614…

MALICIOUS

PDF

75.0 KB Created: 2021-06-06 19:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54ca931633c809a2429ebd8c1e54764c SHA-1: f8fc7234dce8330a03a729a1fa2b43f5d89178a1 SHA-256: 1c9a85d0111f361455906d9b0405a8a6c0ca04993a31712c35d7547777cee34a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to host malicious payloads. The heuristic 'SE_INVOICE_LURE' suggests a phishing pretext, and the ML classifier strongly indicates maliciousness. The embedded URLs are used to redirect users to these compromised sites, which in turn host further malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://medvor.ru/uplcv?utm_term=how+do+i+write+a+sales+agreement+letter
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608793b687c19---67285497144.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8902f2be5d---ruwenotuf.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/uvmrr08inra2146elr5v4ng3j6/batodelobibid.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f620d27575---semunarosedole.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/61c2a3beb8672d4f93cb7658a73896ff/zowidupipogekapebepezo.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160708473a5d64---vorulitexovulesefisowo.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/32db9fd8a2b1654cb708f978a9420c3d/16187910189.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8188eb0a8---nibenatosepiwudimeber.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/b546eu0dr3ujlhsfosf92bha1b/bakusimezulited.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9ud7q6lac28oln79h8hujs3tmd/xuvizaxugosowir.pdf
    • https://diaochue.vn/userfiles/file/37607509262.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac61325a0e---zilamakoz.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2ef908b599d493b339f09a670f037587/kokerawesuva.pdf
    • https://matskaren.se/anvandarbilder/203/files/fixaxogerunetij.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1c20af7e1d0c3b71d12c308ed1fe5715/sofazojev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e898.bin
7bdef58ef934089f156459c56b20789f32070ac61bf320e503fab5402a2b1363		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 5200 bytes
font_01_sfnt_off0000fa3a.bin
aca646e70b6d1ef77a2216ea4af4231e47cf5e2e2bc4260aa77ba352a2e296a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 10872 bytes

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