Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02500ab71b38f79…

MALICIOUS

PDF

73.9 KB Created: 2021-09-11 22:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3674e52a6ac16212ce3a60e77bcffed3 SHA-1: 3ccde09425bada26333652aff0d4c2cc6adebbc0 SHA-256: c02500ab71b38f79cd6a3e05bc59ed59f1da020f2f5d0a305386aaf93c85438e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://podgoricki-klub.me/userfiles/file/fofokuforomida.pdf In PDF document text
    • http://corkpotters.com/images/buvomowe.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/mareb.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/65711740135.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/tevojavu.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/31102466060.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/27647264718.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/18129590326.pdfIn PDF document text
    • http://popmetre.com/news/files/25634525112.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090404282573499.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/razabitajo.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/miladajulizexomixibivemeb.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/77878832684.pdfIn PDF document text
    • https://conrays.ru/f/data/62892868535.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/kosub.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfb47711d1---taxezerotitudebafafefaxej.pdfIn PDF document text
    • http://julianina.dk/upload/file/47891480964.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/6588844197.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1cc3c886d---41226682731.pdfIn PDF document text
    • https://wonkingchina.com/d/files/67416771373.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/46364142115.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/fubimenirazowibapufaxupof.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/79372958886.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc01975f4---kegirotuzowakabuv.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330f0195be6---27589032746.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/97908202340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+mega+platinum+downloadPDF 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_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 10744 bytes
SHA-256: 276ad0f2c181e4220017f35a0ced38ca76e7b6487169b84ae027acd521624a49
font_02_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 19192 bytes
SHA-256: 2766176a84ceacbe561b40c99eb20292ee49d06fbd77bd1ac546262e99acb012