Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a85d34d4948d24d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 23:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e73164dcfe0198254fb30b6ef7c3d655 SHA-1: 14f026c8618e397509059e211570ee9cd4d883d9 SHA-256: 6a85d34d4948d24d6b2f906ff0813378c269f920d4d2a71aeef79ebd70d79e84
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating it's designed to redirect users. Several URLs point to compromised WordPress installations, suggesting a tactic to host or distribute malicious files. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5cbd1e853025d3c3651b4a0f52a18a58/26347624336.pdf In PDF document text
    • http://podhoru.cz/userfiles/file/pukakunalisaw.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/folegapat.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bbd8bd10417c0791c5566c7da338cd58/11950106956.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b597df06494c9499677ce98864bb6d34/sikopidadipa.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa03ded863---ganeraregonoto.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/pusosemogegesixoxavure.pdfIn PDF document text
    • http://healthywithhart.com/res/file/kopumikumuviv.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/fm4atuba6qr9grsumbtuot4150/2691982757.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/a498839fe1771a57e490ec564bbe4165/53537619248.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53326524886.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/80589006134.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d2683a540f89e0b3af0924259d375495/73020624392.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607effb6a33dc---69446015075.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b5b714ff492728bbc14848081ecd94f1/zuwelozemaronanal.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d15d4745f---26797990032.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b1f759b337b42fee72c76f88e5d0f890/40699123065.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210807215621_zf3bzc.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/85584737382.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/55789282312.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081420bdee45---8330131855.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/18858079261.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/wetovokamavidiloz.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/9ec52a2c312617c3fd24cbe8f67d8203/leteribikifatikaku.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/13e1ba33c5149a555b15a293318efcda/34082092762.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/28053502030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ashokan+farewell+score+pdfPDF 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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 17584 bytes
SHA-256: 3e092601ba94a5e24f0975fa60b198250f30da14e8eb805055cfa830fd8d7185
font_02_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 10684 bytes
SHA-256: c16bd8f80c7a2340effd36a584240262cea1854e67dce58207e091444c6f2e8e

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