Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9df3b3e914fea09…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 16:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd7ad5a0a8ba01059c7e6d0829ed836e SHA-1: c8857bc7cd96fc31e01514ee9f11c07f94532f94 SHA-256: a9df3b3e914fea090a16fa39900e1213c0600e01f06fedf6d632c4953ef3aacb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=how+to+install+phone+app PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea39670f77---dorukivakaxuzipemam.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6787a8a0---rakavilemuvexazot.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/pegizovarufeku.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/193018993.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/rikajutiwaxube.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/97501189537.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/40288431891.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/7576026968.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/22535083084.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/wodaredimetozuzi.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/gopuvufam.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/kafidibatolurise.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/zulukomif.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/95837852526.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/zegerek.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/11324841755.pdfIn PDF document text
    • https://samudra99.com/contents/files/47255434528.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/50144139466.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mezevilupifudiv.pdfIn PDF document text
    • http://goref.ru/files/file/53017441257.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4c8c2627ad0ac5cb7c12fc4411639c0d/1508344087.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/leberuledosuvozila.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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 16924 bytes
SHA-256: fd5b34608cc8cacd9c4e879ead65b79450c311b0144ca1dc8d7b7af5cd380915
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 10328 bytes
SHA-256: a0eaec9e6f773bf3f61d1ba9ccf21904ed6d12748c452b0f8f61ce0fbf356f68