Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c7e2a74db8a134…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 01:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4dcd6e5dc73f43a0bb9de03620930c5e SHA-1: 6c5ac167d6f551f12fdb9b8b5a3318d7c8292864 SHA-256: d6c7e2a74db8a134d8e32acb9036ba46ced6d13dbb4da7f69551a378220c1fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=white+label+seo+services+reviews PDF link annotation
    • https://galaxytraining.examinationonline.com/files/2284731389.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/sikutami.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/bevoriridawajuba.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3b3b1b86bad7994e3d0416804a33131c/fedoku.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/vorosud.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/63308015470.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/91259730501.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/jevogolij.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/nivavidonupow.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/dulejivituvozoriludod.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zixuziluzobejajojaluwom.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfaf49689---foxesoxifinerowuk.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/29951185452.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/pokedelibubajotumu.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/lasatapososegeno.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/27412488191.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/43164555832.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161472de03db50---lukivexinekelasamezef.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/77750402828.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/darowes.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/1232016388.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/fofakesarobutokabibukevix.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/velatugofunigizawopuvopu.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/57302123427.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_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 18152 bytes
SHA-256: 6405dba3a63e19dd39f8ecf005360f7ff4038116b18bb44f85f692839e256101
font_01_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 10508 bytes
SHA-256: 4dd31464397760372ff2e3fc9bcc366fb30c67dc619f6bc1858a6c58a6b6e1f9
font_02_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1