Malicious PDF — malware analysis report

Static analysis result for SHA-256 9454b7890eb108b8…

MALICIOUS

PDF

75.3 KB Created: 2021-07-08 06:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74d026fe67e5299f46bd639d79ca980f SHA-1: 1e148ee1309cc3a6e6779c363c73b6b27996fa77 SHA-256: 9454b7890eb108b8b8cdab4d0e030c1b780c3c7e0ba839118e51b49b7b084167
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further malware.

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://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8b907b6a---28531026135.pdf
    • https://cardion.dk/gfx/fckimages/file/vipekakilukufewa.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e277934---61203170998.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/kiviwabodugeb.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070701a4525d---xemomiseb.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e71e2b0c11c892d78cb0965a12f4dfb8/gusibejajimale.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b1a93baa9518445eaa42c891aa3e737c/rokerisekugunat.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160750908c6295---83874793917.pdf
    • http://fogathajtohirek.hu/fckfiles/file/tiwuwidunumosi.pdf
    • https://marljivo.hr/UserFiles/files/rewefara.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608187524a25a---26199656750.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d474b66ed66---gomigo.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2af7dc0439be5685c1eab06b468e42d6/tarefovinurumosal.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6hmquam5mdob7ipihekh6oeph8/56598738518.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29cad5def1---zuluvo.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c484ee3e28b0b054f9bb6b8af3fe30de/80163169496.pdf
    • http://www.europesolidaire.eu/userfiles/files/848346887.pdf
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/48271190398.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609858d67eb30---21439336391.pdf
    • https://hpsoft.shop/upload/files/ribofeza.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc370f60df4---85412130263.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/p31p8onoepo0euua6al5ihjmj9/joferimu.pdf
    • http://aven.su/userfiles/file/95149028813.pdf
    • http://renovator.cz/files/file/83482175687.pdf
    • http://terralis.eu/catalogue_dynamique/file/tevizin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bible+and+meat
    • 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_off0000c5ad.bin
c24914932cd2bab5323fe05046a2696133ed944e81a93068f895175037955565		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AD 10216 bytes
font_01_sfnt_off0000dc7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 16792 bytes
font_02_sfnt_off0000f48f.bin
c2bb16b1cddb86be3106ea072509725aab80ec3b403fa1aac6b3153512835861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16972 bytes

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