Malicious PDF — malware analysis report

Static analysis result for SHA-256 839c882941d8848d…

MALICIOUS

PDF

91.9 KB Created: 2021-07-14 02:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6756e966764e3e31073d555ad01ce49d SHA-1: 61946a2d015d73008e10fbb13bbe8f28460c68ff SHA-256: 839c882941d8848d5a9e0f496be9af4ab8cc5599d6e95dffbd7390b05d21775c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=compare+gas+and+electric+deals
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cd5baf76---duginabefur.pdf
    • http://ersatzmonitor.de/userfiles/file/55533145970.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2427955191---91047534745.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/gorubobuwexomaxupubijixuv.pdf
    • http://nandeestationery.com/userfiles/files/69376785138.pdf
    • http://www.findvoters.com/userfiles/file/60778243653.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/nelumowizeki.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce657b7329---19976407369.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbed4307bc---fajijipi.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/262e062075717a8ecac674046c528b3a/27673742437.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16077b33cb23fd---4842393230.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/984c2515d45e25c6914f045b7f4d4710/tisijaj.pdf
    • http://ff-engineering.com/userfiles/files/lefuvokajosijosijiwinuri.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc67bb69bf1---junumesikaxoparajor.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/58a6d8dea63f58ab42bd9384de68d448/solilazakuvawaluzonom.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8af8ab5bdbac568dedfdce4681db0504/66289693637.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/e1d1f1cdcf2dd7dff86fb249c797be42/vakipibinavibafufevenuvor.pdf
    • http://www.annaleehuber.com/content_files/file/takilamigale.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2f40e734298e94118333f96259965402/miwanekelikozamiri.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3e4d2b7531b628325c2b7455bb15a8a0/savemizeluroz.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2056168d81---zenipebupuwafixexero.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/543623f78b081ca181e8c68461e7e869/jekitanapu.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607833503ebfe---nenafadamizeganebaratoso.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcbb1216eb---49185806092.pdf
    • 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_off00010304.bin
b113c09f04b6faffd841191655f6e02c81b3a73c87fb5684a9b5dbfa9d1509e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 17712 bytes
font_01_sfnt_off00013166.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 16792 bytes
font_02_sfnt_off0001497d.bin
cecdb2bc3c16741ee42f0d6848faecfaa01698582b6ac0f9fdf2f27cbd2a41b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1497D 10888 bytes

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