Malicious PDF — malware analysis report

Static analysis result for SHA-256 204ea65eccdaf451…

MALICIOUS

PDF

87.9 KB Created: 2021-07-23 15:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1070aeea0de07aa321d01f70d6c9936b SHA-1: 42e949e4b2f7c845321b84a4b16eb74901321697 SHA-256: 204ea65eccdaf4511518177ebf19965f3fa27a845603c738a9a0cc77eaa02dd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ikgb8k83mi5kgit2c9s0u4ter5/danuj.pdf In PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/zoxinomovurisobavive.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/12466169531.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/39877508812.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/zigaxemezami.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608879ae55b40---13102214142.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a897b1d3616---punojolorejevobuzujolij.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/1185757094.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/16082770129.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/52398049757.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/xefavuzelifovo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160913481910c7---wasot.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32d06d51b2---15567935114.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210723_200001.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/344ca92cd58ce062e7bef36946e9abbb/renuxadodujezoragifumu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/eee4c979e3c7068c4e1825467d713e30/93233737431.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/velafusexase.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1nm5ul91nokni9uhmb72hcl485/96262918433.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/81246876040.pdfIn PDF document text
    • http://fruitvita.com/files/files/85543851292.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/l5ulkuvhsbp6v79ms08v0m5f90/476451723.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/657c28337186b3ba25e2d43bf4336349/fodoz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cea0f77f8b59347afda610e3778a15c/wubazelipaparujudefumu.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/debaselufikanokagez.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/juloduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=google+home+laptop+audioPDF link annotation
    • 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_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 10604 bytes
SHA-256: d66fb16db2630ca0e979e4894e2f5a69868f7bc9f8f9ef607f9d9351b2debe59
font_01_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 17268 bytes
SHA-256: 9983c7f9232c67ae38480ce703da6b8412c7f1de11610d883ba8df9f6010ad38
font_02_sfnt_off000138d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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