Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ee3c41cb23ea5e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 06:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5513b8c531e0645ef22214f2e90c84b SHA-1: 715cfe90f7d0b982d43fc951f77b0ee369863ab6 SHA-256: a7ee3c41cb23ea5efb07871163d8cd1919b5a6d30ef76c212fef03b468ce15aa
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 a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of external URIs and the overall structure strongly suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=what+is+limiting+reagent
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7b659c5150a65bbafb0ea50d6946b0df/96529775341.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608650fc914e6---vomonalagezugal.pdf
    • https://morganmethod.com/ci/userfiles/files/29227837262.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/xapanizupekibediriv.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098884434449---10172190970.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/85c3f8a5ddcaa7bc30f808515585d63a/64705708645.pdf
    • http://kasystemofkarate.com/clients/861259/File/dufenowiwejalalixite.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/eapsc4727ca07sq7cf8st1u2l8/nabeb.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/juridalagejomo.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079838cbdad2---57086299896.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/57080be5ee8cdf25d9fd994eb62fafe0/momepo.pdf
    • http://nuitsdartistes.eu/images/file/2708755566.pdf
    • http://ferrogep99.hu/static/media/file/tososogaxilatijodenoritek.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ske1e1e0tua1j7icps25tid7q7/38562559466.pdf
    • http://nationalcoopadvisors.com/userfiles/files/baxariguxin.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802cd5bd451---fenikuxab.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/nefowixawevekubusakuxo.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/122b6b656e6897cb568ca976c7c68d9b/telojemutef.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/feaeee1d06afd2d30b1b1efc79515fd0/nixavapexe.pdf
    • http://villa-carlshorst.de/sites/default/files/file/bufubavefukiv.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a7f18f9f502d978928506c62dffa5145/xusomenadivobumo.pdf
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/suvejepepopekozumujuwo.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160925434b3772---fepipiwi.pdf
    • http://katyababash.com/images/uploads/file/91235499663.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6abt1q6dt86mpfjjvand21s1mk/mazawiriziwanapetomi.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_off0000f4c3.bin
3aed561d72d9424b279650594d6490cb7e81ee17aedd84f2ac5fd8fd7f3f2306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 17360 bytes
font_01_sfnt_off00012271.bin
38e80ed6f67f057965ff429ffb916dcd3bdf1b416816e2c4a30b4589ccaf8db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 10428 bytes
font_02_sfnt_off000139dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 16792 bytes

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