Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3166679f5867eb…

MALICIOUS

PDF

71.8 KB Created: 2021-09-30 18:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 582d54e0ea171c201f2fced30896bcf4 SHA-1: 403abc1983b6a096e2e2c8507c86320289e8e212 SHA-256: fb3166679f5867eb2dbfac9e4d8003cd747c5226ba260d7341631d0800d6996e
196 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://chcial.ru/uplcv?utm_term=how+to+enable+volte+calling+on+any+android+smartphone PDF link annotation
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/jiwajit.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/68823405452.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/151852202332.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f559d35135---zenibumopilujojogadomilo.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc66549f3f---77860974401.pdfIn PDF document text
    • https://btegypt.com/file/73020259379.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/79210064085.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/puturaj.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/waporepenemokumulop.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/zovisadovemowukif.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4f310fe4---45676059868.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c723784c5834e9dcdc5552260989e211/vejevoseletikanipa.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/kobibenozolasowarifomemu.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/68269628132.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/kuridexis.pdfIn macro / runtime command snippet
    • http://wwsm-hk.com/files/file/kimipilumalalow.pdfIn macro / runtime command snippet
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/xasasazefukoseviromugo.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/64839568120.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61501fe4e3efd.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/31888482942.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365dae6da33---65174967376.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/53187592447.pdfIn PDF document text
    • https://cape-electronics.com/media/file/ruserulorugixajezu.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/zedibuz.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/somodaxuxevaj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB460 16176 bytes
SHA-256: 2bfa4045e2ff3eeb00eb52842f6fa9ceb6f264d82013cb48fc698161248a678d
font_01_sfnt_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 11360 bytes
SHA-256: 4604c5868a3feea4d13f60ceefc1cf876ce1c79425bfd68f9aeaba2ae659ca93

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