Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eea1c38e8cf4c7c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 20:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e4d4fc2d419a1637aab08c2f17cc213 SHA-1: f2f7b4de510c07b852e472361b574f9351162e63 SHA-256: 1eea1c38e8cf4c7c939a25816abaf8c4bdf2f90d7ea8bc4633bda987e7ca39e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=sword+art+online+season+4+dubbed PDF link annotation
    • http://rnralpha.cz/res/file/71769023565.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/38450762596.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/kogubotokosogoxituxe.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b24248d2aa6c987d3b3c99ab6fcd9592/62645527603.pdfIn PDF document text
    • http://perksys.com/userfiles/file/58784801611.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1681e5eb---jupipetusa.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zodugixiwesitedij.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/90891715581.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/tileve.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eade697e78---23017113391.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/vadupikom.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/77977104228.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4c7qd2p4h9s0gei05p4q1psq40/95133489903.pdfIn PDF document text
    • http://cascad-trans.ru/files/74283877002.pdfIn PDF document text
    • https://solturism.ro/images/file/77857245122.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/68384960588.pdfIn PDF document text
    • https://slotpt2.com/contents/files/95788605515.pdfIn PDF document text
    • http://standdominica.org/files/files/rixexide.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/vipanugotel.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136acf6597b1---61139930539.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_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 19944 bytes
SHA-256: 2cb42e4065f6f61a6291dc1f1b2f7fe3246f929e44b22c8e397851e44058b35f
font_01_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 10720 bytes
SHA-256: 18469338a16dba6098583e52dbe892b8c19ca4a91b096217daf03337f09ea7d0
font_02_sfnt_off00011f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1