Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b8c42389692bc7…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 20:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11d97951f59982196e6008831cf3aa34 SHA-1: 832c7ee039b7f9bd74df724f371aeecd60b6c1fb SHA-256: c0b8c42389692bc7a5460526518f79acdca77df670bba83e55198004e9df04f0
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads. The embedded URLs, such as 'http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136efb613b18---47427229124.pdf', are likely intended to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kstarsmall.net/userfiles/file///jenodatejibav.pdf In PDF document text
    • http://0932018255.kad.tw/kads/ckfinder/userfiles/files/86983023310.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/xomunotirefu.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210918235431.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/67891087053.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/15422190694.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/29248717827.pdfIn PDF document text
    • http://lulanjina.net/upload/files/tosedazurerarat.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/32579383683.pdfIn PDF document text
    • https://activepymes.com/pub/file/51476416709.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/12605606225.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/zubuzadul.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/vunex.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/10881268750.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139db600498f---63711030252.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/gejibezizideviwofetorixe.pdfIn PDF document text
    • http://pasquarelloplumbing.com/UserFiles/file/38480517684.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/fexofeje.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/80140224803.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2294e15c9---wibabu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613526f4c8f42---penabosexewebubusevuri.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/17601673812.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b641003fc5bced5b8c0ca97f91b5514a/90435900416.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136efb613b18---47427229124.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/76747603467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=app+to+watch+live+football+match+on+iphonePDF 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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC87 16424 bytes
SHA-256: 81aac8ca4fb23170b53a5a90205f6b3858f59e72f244a6506b3dcc387b825a3c
font_02_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10752 bytes
SHA-256: 964a39174e984f940c544d19d85bb4c789470f0cbf80c796cce28ed7e17c417b

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