Malicious PDF — malware analysis report

Static analysis result for SHA-256 88943232d572880b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 13:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1aa60659162664591bd0f988eb2c2c4 SHA-1: 36fcfed2f373cb9c9242f2800da010be38406573 SHA-256: 88943232d572880bfad8b18c92ab69e760596e48ce526bca85cf3fb5c1728686
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 an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=colligative+property+of+solution+pdf PDF link annotation
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/da767e3771f9346fb95171238dc4815f/xezuzupubutiguredamera.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/71fgq41dgvaapuov344t848h53/murujojuzimajebifek.pdfIn PDF document text
    • https://rajaunited.com/contents//files/71137529136.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/f2kqrcn4lskgbrupfshe0337co/mokugufibure.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/60092505298.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/lunujelepixofewebixixe.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772f669d281---20840771690.pdfIn PDF document text
    • http://espicycooking.com/files/file///40242025597.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/95903775594.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/bolevejugubagij.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/logemokokababosojivoxa.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/263986879.pdfIn PDF document text
    • https://fobh.net/userfiles/files/9972180956.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609236638db08---11298505436.pdfIn PDF document text
    • http://deltools.com/userfiles/file/47855592401.pdfIn PDF document text
    • http://svx.su/ffile/file/32514568495.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4af584188---biwagunefevenedusab.pdfIn PDF document text
    • https://digireg.dk/upload/17162891049.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/93614236697.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/4987610010.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/94429616425.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zokodizifowewonere.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-10/20210710191155918486.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_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 18512 bytes
SHA-256: 5a6ee463e4de2d9b23f3449494925b11f13f6e7a436eb14feac20657cdb3d813
font_01_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 10984 bytes
SHA-256: 0202286fcf32d2edd5214f466d21a911313cd6b13a28a4a2cf87737acd548109
font_02_sfnt_off00012968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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