Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a2a19c843c4caf…

MALICIOUS

PDF

81.3 KB Created: 2021-08-23 11:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad75ca0bfb9264f50ecdbeee058da60d SHA-1: 462c76b05292ed87fd9b31c231a857fa44c01f08 SHA-256: d6a2a19c843c4cafad414db20051cf8836bf689d718705d725909c81fc323b6e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kompaspt2.com/contents//files/6817277298.pdf In PDF document text
    • http://aucoindeshalles.fr/menu/file/12171469715.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51d0f966ab---dobegazeximalu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1836ick6ng3liej5cpicncpp3/dapol.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/pivazufoxom.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6171df1972aa4f7ac3a620dbb5ee68fd/66611796688.pdfIn PDF document text
    • https://flomogroup.com/upload/files/gexuleg.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/96906148689.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/93975410059.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/detakumakivak.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/65647378835.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a1033f87f332998da7974d65d0966261/suvunejunonakefi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1f18db42cb108939e1c6a6179bf8bdba/mazulosokan.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/34875862276.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/mimopov.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4bd63945---82505514459.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e666187e3b---nezewariziziwimikorawoma.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f1ee269f---99011127414.pdfIn PDF document text
    • https://badrivishal.com/media/35049729241.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/61caab62e144af817a9d59b97c1de222/bilazevanujodaxuri.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefe0ea42f---56379074886.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/64834169890.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/80866773796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=opposite+of+colorfulPDF 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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 16548 bytes
SHA-256: 7db9e21ea0fa34e57e37b4ddece2090c0b1291e4c0ccfc21ff4376271140ef17
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 10332 bytes
SHA-256: 316be89b29a6a07c603fcbd6653112a3424546d744029ad52d4c3434ec8407ab

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