Malicious PDF — malware analysis report

Static analysis result for SHA-256 964586df8da6be74…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 03:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f16c80ba803366315c8dd5b27d9cd08 SHA-1: dd615fcde8d5b3c85b1752599c11c2c6b221ce3f SHA-256: 964586df8da6be7428e2e59861721c3af5c1f76eafbc5bd256dfc207cf23a5c9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on compromised WordPress sites and disposable domains. This structure suggests a link farm designed to redirect users to potentially malicious content, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. No scripts were extracted, but the primary attack pattern involves luring users through these links.

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://queure.ru/uplcv?utm_term=how+to+stream+harry+potter+and+the+sorcerer%27s+stone PDF link annotation
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614237dc3a65c---gimexagevemakajewimitoku.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/girefasixom.pdfIn PDF document text
    • https://raljob.com/userfiles/file/4187741484.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd421131c5---84467075995.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/4876292897.pdfIn PDF document text
    • http://ud2-140.com/files/mixibozugikonedukudu.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/falisolujelesinekefikuban.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/70d6d1509ac3eada0b40f5edda710908/lamofowimodegavuwinepiv.pdfIn PDF document text
    • http://4darchitecture.org/img/all/53701569552.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zewoxetigewotekiwamalolon.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/43016922225.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/41028792179.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/siwakamijanaxutofuvik.pdfIn PDF document text
    • http://mylodge-naoshima.com/24375607943.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/maraso.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/97708307486.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339d57093a8---nivobojedulorulig.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tijamu.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/wuwubetomum.pdfIn PDF document text
    • http://wdnederland.nl/file/31910540282.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-11/20210911074634987696.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/68291416400.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210914000118.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/wafojateze.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/zawizufonomuben.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_off0000bf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF12 17460 bytes
SHA-256: 52bd0fb0028ed04f4e178d2b46753a348620e4000f2c6bfd6c86a269fc29e3e5
font_01_sfnt_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 10868 bytes
SHA-256: 489288e98c5d0e1a686d9b2c5b15dd30418afce0029af6f8f291c94f4e63eb17
font_02_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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