Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbf3c01d0ed670e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 19:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75bb472111f1cd6437a1318778e1724b SHA-1: 1c730ec33ebb21a6942af41ce75a56860f44bf76 SHA-256: afbf3c01d0ed670e5565e58e7f41980e6122a810192f210f8d4a75676222bd71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://catamma.ru/uplcv?utm_term=indian+fashion+stylist+mod+apk PDF link annotation
    • http://tecs4.com/intranet/ckfinder/userfiles/files/gukulowefukizanuve.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/73274548789.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/48882432428.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/65553309597.pdfIn PDF document text
    • http://gewald.ru/content/Files/58940680733.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/besawefawosi.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/28228444299.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/32903996219.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/aoi8vm679vpp77viedh59mmch5/39262749240.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ka392u90bhi92281gv57jpa6tm0gksf7/56199571261.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/loterinejexajoreduze.pdfIn PDF document text
    • https://blv.by/upload/editor/files/wefutedisogimak.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/5255345304.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/7739180549.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/13985075287.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/63501967513.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/10897686644.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134268630758---kosamudedizoriwirolimure.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/27513181177.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/7797413358.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/mabibu.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/pisalekomulagol.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b38c188c---rewosupuluru.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_off0000cd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 17524 bytes
SHA-256: 8fcdcc00e6083cd80871ed0c2b04c1fb0b7f33e3f4e892d3cd4d808e04f7081b
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 10688 bytes
SHA-256: afd276b352a287fb97a64a7e82b564a235bcafc2d435ca298d1d75565f8f4d7a
font_02_sfnt_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1