Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a67108cf3306420…

MALICIOUS

PDF

92.5 KB Created: 2021-08-25 16:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e2a4eaab6469d6c511202b721148181 SHA-1: d9efdabc28b6dc96752b733f7e96d2fd4f10a065 SHA-256: 2a67108cf33064203ea7139b88830814807cd0389ed207eee4ebd9abe0653b61
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 CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=eng+to+persian+translation PDF link annotation
    • http://bahattinburyan.com/userfiles/file/moxari.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/jisogowebujukigifeki.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7115d2d977dd3406c9380e91eedb79d9/pepomame.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/xumotagopebenivu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fad3c254---tesakudogi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826839a003e---selamatipixepeti.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210608_405035B6DA131155.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/95393869137.pdfIn PDF document text
    • http://prosquash.by/data/guvefebu.pdfIn PDF document text
    • http://chapelguild.com/images/usr/kexewexanumafumukiwapexe.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80c031cda4---67828405103.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f5977caa7---mewaf.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18ad743df---duvemusugux.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/xenegowozefedidemomudiner.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/748938003b0e551e8a96e344114ddc9b/galezulimixobosiz.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/kobigu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5250726814---guxidozikide.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/degerux.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6551944521---girejavow.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a16a5359f---kapitenewajav.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/lidowofuxujibun.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/birudagikezikagijepelos.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/sebukasinev.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e8fbdd021b807a79c70d5e5810458523/sopumegemuzuwiliduludume.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013b1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B1C 22880 bytes
SHA-256: 5783a8fa5d4e35b822442dc6c273f1e227187c7441fe8f4fb41e519eeb52c387
font_00_sfnt_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 17240 bytes
SHA-256: e7d77568e912e48d1483898ebbbd05c4e68e652de28922c591a584bb382dc70d
font_02_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 10412 bytes
SHA-256: 9627d3bcc439748e064bd7e913728ae91ff5f592cf74c9980ad0a19b5f0d232a

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