Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50236ec02b87ed1…

MALICIOUS

PDF

81.7 KB Created: 2021-08-30 16:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c90a07c3362378528e6358f40a6fa78 SHA-1: 7d17f27870933b11dc9caa43a7d6a1e659129d8d SHA-256: a50236ec02b87ed1973838e9c7f747956ed2e5b036b9e6881cafc8bf48a53383
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress sites. These sites are likely used to host malicious content or facilitate phishing attacks. The document's structure and embedded URLs strongly suggest an attempt to redirect users to these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160744a09219dc---45842461808.pdf In PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/50334799999.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1364e2e62---76163224798.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210530061007.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/67018476badbe33468ed20367baa82aa/9330025089.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/70977743039.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ace0da58---99259019490.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf6529635---73407761458.pdfIn PDF document text
    • http://julianina.de/upload/file/fotisewi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607210030e55d---52936699791.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/s1d97be7mi4q0rqme4atpsmap1/53934322542.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609673374d749---dikowaxurodalusa.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/wevimosutotalevojes.pdfIn PDF document text
    • http://ibb-online.ru/f/file/numurikuketirezal.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f0786d1e76fa1ce4af3835505057d23a/84514270430.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/lejatet.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/61e598ff84254b65b97a1817205117b9/jefunekezirufopakewe.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/73136564225.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4d78ac62f1931ad95b604a4c3d34d5fe/wabalatojabise.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/gusubofedepup.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482a0b2253---80542656288.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/wekadifotixetagokitev.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/88065679567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bichon+frise+and+poodlePDF 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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 17488 bytes
SHA-256: 8652899c73b05d76c512fdd067506259cf875045766f094fcb583dab4e88cf64
font_01_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 10672 bytes
SHA-256: 8881e099156946c178bbd38aa80b291a69adb738b6d409b6445a9e81f06256e8

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