Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86d4df3700914a7…

MALICIOUS

PDF

115.2 KB Created: 2021-09-04 05:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49825292cac0c8da7cc77407aae44781 SHA-1: 0858723d87856e70af3493835159c4277aaff3ad SHA-256: c86d4df3700914a732882e1958194df868acaf3a733281a1d5b25e3b7716a0e7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=types+of+sedimentary+structures+pdf PDF link annotation
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f53e72418ad19718dbad2d8a6b14fd4d/14994796888.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/wesanipozipazariroxufu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161216c554b783---sojajakasenifevolukolezo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6238c6736c---42717208908.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/uoo06735e0k5ho6d47q60mm0jo/kagatumobefufunetejozal.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/65744bb783f786f76d8f20b67786362d/tomoginasesamulebumexupu.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/wigavojigiso.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/48071513628.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/80831644364.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/18305433539.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b040a78c92a9f9b0e7641f8cf86439f1/94099376759.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/rovidejepiledoberigilaxo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b762fd4b70---xuvupa.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/kmpmq1uiudbs2fj7jnonjnraot/mizozujot.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/piloxiluvozodik.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6pd5es1f9ihffjqrninobkbao1/40831536374.pdfIn PDF document text
    • http://safarang.com/basefile/files/31450307025.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a9c88da977ff87946a7e82fae0628759/bitixekakolovijapezuzo.pdfIn PDF document text
    • http://falconltd.pl/cache/file/bemeninatelakezirad.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c259ac62bc---fikobikurajaneni.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9d5b0707b0cd11f3adc17f3d47817eb4/wosekigun.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t1b7qeq794v9te4qaja7e5htop/51342591714.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/2497644614.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/rutekimusafud.pdfIn PDF document text
    • 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_off00015ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDF 10912 bytes
SHA-256: 278062c097d1f2292735f85cbd37b1ec6cab53221cac5ce605420096977544a8
font_01_sfnt_off0001772a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1772A 18096 bytes
SHA-256: 6f5352d536ad4b197f0152b24f694a041959ff1eefe2e4a9062ea43c7bbe976e
font_02_sfnt_off0001a6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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