Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfd501e61c7af90…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 15:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 311e0815f70040494c2fd50e86f96343 SHA-1: 6c1479856884b181b7cb035e88a26ebe374c5bb9 SHA-256: 2bfd501e61c7af90699fb057e45bcdf0d4ed833c819111b9e3e206787005fcdd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crewmak.ru/uplcv?utm_term=postal+code+bagumbong+caloocan PDF link annotation
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/marixarunukod.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/vavukujedabak.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/rolarolesogegerexefepenub.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-20/20210920022736578142.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/70826671793.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/73684548018.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/vigolumepubijef.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418ed599d69---6389916893.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/fojigewakatitubetivede.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/tatevomovolajer.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/mesikebabesoxiz.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1632509136.pdfIn PDF document text
    • http://organizeteknik.com/userfiles/file/bajelisipamupegozubumuze.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613843cc4e727---fovubopukew.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210904_B7386FA2CD7F972A.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c200dc0a6---ragobeso.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c5c6f98c94d60889eb50cb25373538da/denifubomasa.pdfIn PDF document text
    • http://ranchobg.com/img/file/49820400803.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/97666579718.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/gomiletogipamosirasi.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/lavewulanubupoborexi.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_off0000b06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 10764 bytes
SHA-256: 3a2548e63b47e45eef21f727ed7c1492e1b254e1a80f463343730f1f76d83bde
font_02_sfnt_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 15340 bytes
SHA-256: 1fb8a26c2cee81812978588c83a544fd219f7d33680dc0de0501e2eaf2ba482a