Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f68d4dc300f1673…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 21:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 60f7a264884da68026131b35052b4f19 SHA-1: f860343f5c2548f3f57426c9466b4885bc82a007 SHA-256: 8f68d4dc300f1673365ff640f91bef255d3941286ba3e01e9add685ebd4414d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to the download of further malicious content, characteristic of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608db4ad3a967---dezekitisopomowegururi.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51d46e5d62---88276597780.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/81636618240.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/14228912808.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/volesefesubanug.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/31351596034.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b77667dc1---pazipurusesexazadeb.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e108150d7---84209971796.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/7923326945.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d4086255---56091216180.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/fulanikupureberoto.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/rekupelefomirexawakulipev.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e8e6ed5acf28fafcadc11d40ef308ee9/87846852122.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/jojaximuvavuxidak.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/xusumuzadoruse.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3353d6156---67718135302.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1624932506.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ev8l91a45l040r568ofhnv10p8/sizugoxefevujuto.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210615_0C2F3707C2573248.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/20881118745.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f80f37db9---50049613875.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/vimezozizefijojaximopog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=welcome+to+the+nhk+novel+pdfPDF link annotation
    • 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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 10516 bytes
SHA-256: 8111b1efde2e8e28292a350cbb9a0974bfd2a239427f3c11b23bd257c57baa93
font_02_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 18820 bytes
SHA-256: 28924ccf549f723bfd9579043b7a7f351708429aa9395a7aca3b052e3797a5f7

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