Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aef4186ab7908b…

MALICIOUS

PDF

93.0 KB Created: 2021-08-11 11:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d62474959588ed4bce1ac87c5214a65f SHA-1: 49d140d61030b9f08f950f936985a890e7d549fa SHA-256: 36aef4186ab7908bb45970f7c4762a2213ada451e07fc3a0b785192383eb44fc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's a container for these malicious links rather than containing readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e6effe185a31e144f49470bafc83583a/kibozofunotinuromokeg.pdf In PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3r00a4b5acup1lmo1deeig9na6/kemojiwixen.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eeb6640b0---fugutatonibanefal.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982aa6a1c0a---22936387041.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/ml6hgdsva9tkbb1g1tjucmickq/gitelanexokasogumolub.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/77ad3a21f94cb2cd6d36d12f29c0e857/wefowijewokusifedetuki.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/rudabuvafoxujowataf.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7p6p713ct399s05qv3da4gf3fd/90521534676.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d83574835---mojewatefepuxor.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/vaxuvop.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608503952e179---winabid.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00bf8c6742---buratabitaxawepebikexikiw.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/dd77a6f34c1d235bb44ed3132663516c/pubuxuvatopupanogolodi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c821815dce2fece784aefd13ba943028/42473939943.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ilbdm2tvgk94th7hpirstgga35/kobekoxusasiwup.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2118b9fe75---xajazupapeganubaruzev.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2a6a85e380c681d511955525011fa647/voxelikuwuxoba.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dd3bdf1132434c9e0a119f01dee97bbc/pigeduxodifam.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be41cdc7c66---setokibowogobugajitazuko.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/61757558711.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9f0b09a97---89708795878.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1568bccbea---28003563105.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/22095975991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=les+figures+de+style+avec+des+exemples+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_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 18876 bytes
SHA-256: 7bed8d22636ae5e13037c7a273dca08e9e038e6dab17a8d462b58cd36a327a31
font_02_sfnt_off000149b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B9 11080 bytes
SHA-256: 44ac2e0072cff268f49e3426bf8d00b707c831bc3816edf316c663ddfbe8b303

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