Malicious PDF — malware analysis report

Static analysis result for SHA-256 088bfd395541a382…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 15:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4d8267125c4b608bbd799407b6be030 SHA-1: 621f90d6f968860f34160bb836071c5ba6ccf40c SHA-256: 088bfd395541a3824fe4ab2928296fe2a093ce9eeaf6e142882a3deeea86ddba
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=adjective+order+english+pdf PDF link annotation
    • https://ovistar-dz.com/ckfinder/userfiles/files/58452432812.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/vananebumulaf.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/9199074958.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc1ae9f0d---jexixipunezawotabuluno.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/17955723756.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/48198266399.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0608cb23e5e19ae1eb3617c43f1c4db0/11249818166.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733f9798961---xapavejinekanidumupovad.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/lapuvodajozi.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/saxoru.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/seworabudoritine.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zipulekudo.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/lodufozitororo.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/494762775.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16074496d1d375---84088035861.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c1710259c2d5da37789ac85cc250dbe0/saxejotajasonow.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/14178638241.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bfec2a69c---4776015164.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fiwabunefanabibuguso.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/mugelimubobefamabewa.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1c03ecdfa4e11e1bdbe92e45c6d1466f/82428205710.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/958b0e1cbf1495ae1159ac46273dbdb1/43225062652.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/14439261600.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_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 20312 bytes
SHA-256: 1c838ecc8d0702858f78f3e9ceea25183032f3f56d1a64c825f32499e8c60be1
font_01_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 10912 bytes
SHA-256: f76b08187b6ffafb512f2e6eb398dc206f82a8a572b46388123dfcadf3db6c03

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