Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed74ba53762ea6a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-07 22:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd2d53c02bc4bfb5e95c82853ba59134 SHA-1: 64c0053b2e03c7cfd49b6cfc22eacb832eca8a6d SHA-256: 6ed74ba53762ea6ae6ae0483a459d9f82fb70eacac5dac31f9ca552b1b3907c0
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 compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=afmc+question+paper+2018+pdf+bd PDF link annotation
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b8cc38733f2c551477440f111713b7de/78505064676.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/zivabipovuju.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/22057348902.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d56ac9e561---boremum.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/63202638165.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d38828a70---vopokobemi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/12f87c17a4f497e5b3f0c4275c78d6dd/63723861270.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8b199a5ef5f662941371dbe5808157e4/77453080646.pdfIn PDF document text
    • https://plasy.com/uploads/file/vidasekinunu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a25204044---felivevulasupimepuxubav.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a6ac9ae98---kadotanolemokagawipop.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/29076591344.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609473fa7c261---46481075190.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/xiwowedajusavexuxe.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/47353940392.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/43692305685.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/75508518023.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/59083363056.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210615204703.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/86060832536.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/72192301581.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/67135166311.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/16517255105.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/muketasunemawipedaf.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_off0000b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 15928 bytes
SHA-256: c9d8d6485ce3337c26c3e74f3ca59f118a7db548f657174e1e9f713798915cd3
font_01_sfnt_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 11604 bytes
SHA-256: cf4aab8cb97f37c38576cf2b0b144380beba105ab48f5cd9767bc9e62400558b

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