Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d31fdbab5a6a2a4…

MALICIOUS

PDF

97.1 KB Created: 2021-09-22 11:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bdea4fa42956e21f5a0615c31f068cb SHA-1: 593cfba5e3777586818575f48f05e7b505bca3af SHA-256: 0d31fdbab5a6a2a4a10c4ba08a7c8b76ffe61f1f938f2d99ef247fbc4a489ea5
224 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of an advance-fee scam, presenting a lure related to lotteries or prizes and instructing the user to call a phone number for resolution. The presence of embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, further supports its malicious nature. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate phishing or fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=best+rts+games+of+2021
    • http://akcompany.vn/uploads/userfiles/file/60455641418.pdf
    • https://invision.buzyhub.com/files/ropuxuxafujilug.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d50ea645ab54eae0950fde2c5858b25a/26222213276.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b13a5234d---92886403058.pdf
    • http://cementfeet.com/userfiles/file/24657448912.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/tugamodutijumamu.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/17733542613.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ff5730da2bd398c1f2f2b6a6f109a8bd/77554227223.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/60538133598.pdf
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902052436870875.pdf
    • http://www.como-grup.ro/fisiere/file/25680068013.pdf
    • http://qiuyutv.com/userfiles/files/20210921090446.pdf
    • https://bloc-immo.com/images/zevejizu.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161415bb03eed0---54480972788.pdf
    • http://labuchedeberce.fr/userfiles/file/58696321858.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dawapomovexejatasapomof.pdf
    • https://www.wemservice.com/ckfinder/userfiles/files/zalepewenovebonuvigepiwe.pdf
    • https://vietnam-pump.com/userfiles/file/34858949690.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a1c41ed5401d92f80e24b8cda68ec350/jiwup.pdf
    • http://abwva.com/uploads/files/dakatuwume.pdf
    • http://gps-ambroisie.com/ressource/site-image/files/24271778233.pdf
    • http://tongkhomica.com/upload/files/58700626758.pdf
    • http://optimaglobal.net/ckupload/files/juzokorujimuzubexisiv.pdf
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/gamobabulokotu.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011987.bin
0bf60d0bd17ad1a23c0bbc1d042cce5de56027f82bec668e70261bcbbf1f395f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11987 17148 bytes
font_01_sfnt_off00014613.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14613 16792 bytes
font_02_sfnt_off00015e2a.bin
b54fe5a355f112d90f52bca5803de46c2c9baf167622db9e5e9470d4c5a69659
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2A 10660 bytes