Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2e0d81b6e416a8…

MALICIOUS

PDF

86.4 KB Created: 2021-07-12 16:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cccfa173ed1fe603f697d66a0cda7355 SHA-1: 9e4be96cf56e6cd8cd4b865f8df39a1d1abeb55b SHA-256: ef2e0d81b6e416a80b51d7a95457d10fb79cf14073c26807c46b353936d8a1e7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allaboutdowney.com/userimages/tumawotovanuzupekofarobik.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cd58353405b081b56808fec86227ad4f/35919382654.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a294748bced---71975691793.pdf
    • http://www.europesolidaire.eu/userfiles/files/31386630191.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8eb092c1---99501287404.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a97986d85---40540445330.pdf
    • http://wittlich-luexem.de/userfiles/file/47442201621.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/ed6f6de5c5298c9b69efdf2fdb71a90b/dadoviwixifeguvap.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/15njr98gclqs9tr9shmfqtgkn6/60391070423.pdf
    • http://architects-desk.com/uploadsfile/55112154815.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ac181711dbb045c72ac1125d5fd989fd/52231665602.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/picm3i4ias9q4k353elri316i0/puzitem.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/222f5e7cacb4267217890ca277fcea27/waraxowikakivupegawoso.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903641ec40e---76503754871.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160983bb502308---xefofinubidixemobemob.pdf
    • http://kapli74.ru/upload_picture/39536470545.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a237782bfb4---xexesoje.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075659cbaeba---97742946866.pdf
    • http://biurod9.pl/public/userfiles/file/87407674290.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/t9ldo94fa9k88dt0dl12du15o6/wagatonozizo.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2792e7435d---57059436916.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/odgs05u4ff7bm1ba3u6ud6hel5/95922278531.pdf
    • http://france-ex.com/images/blog//file/tifudofipiwomoxarewiz.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b88a2f996---govepeguvogudisotov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wishing+my+mother+in+law+happy+birthday
    • 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_off0000ec16.bin
e814685b990182c6962b567884ab82dbdd85ecd92c5d571e757f1b1d2d953ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 17168 bytes
font_01_sfnt_off000118ab.bin
c2e08ba9e1a9923300214a6b85de7a62c46d30c40ead404c28f4b90bfd83c3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 11172 bytes
font_02_sfnt_off00013231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 16792 bytes