Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d2810ba8f8a284…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 21:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac8a06b699fee8c38577c62ed89ffefb SHA-1: a6be6f0d56b551e34c0a9e20dfb7bd3f8d26e996 SHA-256: e7d2810ba8f8a284ef907498a65ccbda0fdd4c5152719f03190d788c7e0e0fab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=mitutoyo+digital+caliper+user+manual PDF link annotation
    • http://cafesezony.ru/fck_editor_files/files/jinodunakuxobefamu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/241c9ea638db059fa40a36e1bdf1b301/wurige.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/jepukipanemomujifupez.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/rulobababavedoz.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/70169241137.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/77992524840.pdfIn PDF document text
    • http://praguetransfer.com/files/file/xalusafelifig.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/75uj8306t9jrqlsqncsvif56g7/66943336333.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f2cdffbc---dezurenuko.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/deqh3g4bq55odq1ijepoi9saj3/93577463520.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/lodenutilimuvi.pdfIn PDF document text
    • https://tckontrola.hr/files/3762920994.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a3fc00d8592b1dc781ff40998488aa57/paxikowolowosuj.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/tukisu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c37f24de1---kumesitozivifavukubor.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d99e1a60c67---jikisoxekogibo.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/felexaverasetiz.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/15b892c344564df2fa5341c7f259dfd0/44968188184.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/94120403101.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/tigusotoguluwimalanemiwip.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcaea99de3---porofunedizu.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_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 11064 bytes
SHA-256: eca93835867be93de691ddfa5c43d2fa27120a83ecfe19cce3f089d5bbeef61b
font_01_sfnt_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 18396 bytes
SHA-256: d4c79dce01a5fa8f7229f22665597fb3d9b87cdea1f51ddf3d634d08a80f9344
font_02_sfnt_off00013154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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