Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92a1244af220adb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-08 00:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a45a06860c2df271e26b09a844b7bf0 SHA-1: 72f56ef08a90100aa22edc35c939e645673e0093 SHA-256: c92a1244af220adb89d4dc12d26c207d5ba9e0475a08561b0bc209da7018f940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=bone+and+soft+tissue+tumors+pdf PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc2614c31---dajiwenaxisemo.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/76795536928.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/10646108114.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/rebiwujigugiri.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f250895c7762744842cd1c0631c0d18/111236092.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/20245639359.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/dibevegunazetujovudapabu.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/98921003493.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5b58d0d---rabazi.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/rekibovotuterafoxezitidu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085107fbfe04---mofidexa.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/45800338141.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/25204979559.pdfIn PDF document text
    • https://m3csrl.com/file/pexikidel.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/49798694983.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/neposeg.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c83242f156cefa03afbc913d1f9c4b53/gazowipeb.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9e3cdde1f---kokumojavefujewuretujeve.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/xigerubufug.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/knq9v993tugdpbmiq98o58nja0/38701158247.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/8450218890.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/62818825560.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/50111049166.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_off0000b44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44D 10768 bytes
SHA-256: 8da55f11b6595d6835fac56b2b2fb44adf39bc430ae560a11058a792c741113f
font_01_sfnt_off0000cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 15780 bytes
SHA-256: 0d5c03b7ff5f6fbea94d9816bd1a69d70383e072a489f37c24522dc9381c420d
font_02_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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