Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d96c629af46adb…

MALICIOUS

PDF

89.5 KB Created: 2021-08-03 03:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f769f71087ccd0bca7b8686368a447c2 SHA-1: 8532ef59f06dad6636e1328ac3e0971b4910b6f6 SHA-256: c6d96c629af46adba09b0a27c7168dd974e599be93ffd5604156d2f956e4bf2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it's designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. No scripts were extracted, but the structure points to a link farm used for initial access, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=toyota+avensis+verso+user+manual+pdf PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc6ec16ee---36939168121.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bf7df98397788ee63879ba27ea765d29/19012554888.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/mogegizevubalaniwodapeduk.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/pegemexogunulonogo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609452daac200---23555541675.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/9039246720.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/pelumexemedivotuwa.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a71fe17ae6f---vizedofaxogabuzulibiken.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/kajorolabelubaxis.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/55797547454.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/88c0ceef1dc34053a2e9b617c0329fd4/padifebegamudodojaze.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pijona.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/detibonuturafapor.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/4e19bbo3nvaeg1hlqb0k34h71i/fojekuwapej.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/1b7b129e1812305fdfffa4cfb9bfdc67/94622954598.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/gatotogotilim.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0a1729d72---fepejofamukopijuv.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/55401215983.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/n15lm7ifmeo2et2c5budch4nv4/92788441175.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/lugubovanopup.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607336bed949c---womugibeduvolalugupivaf.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/77949152621.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34b8c50a6---578003988.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/12068437245.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_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 10900 bytes
SHA-256: 4fe15262c8e786d001197c7c5de60b91afaec3c2d677830d6d38ae6dca3ad2f2
font_02_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 17268 bytes
SHA-256: 2d1e79a6ca434233da452635789a908461b832e8eff226e1e50a911b9c992905

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