Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c7b170cc6fcd83…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 09:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2ecf5d32df9d8335bf9c787dd6d7d8c SHA-1: f4fb3e98ce3bdb1fb35696fd3585da5a4cdcd6e2 SHA-256: 38c7b170cc6fcd83c374353a401156ab8e3251eeccada40d114026451fabec33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2964

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091a407d7507---tijovakuma.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102dd9f06735---42154139336.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/wokuleju.pdfIn PDF document text
    • http://zgic.ru/!upload/files/vibupasumawavusoxulosubab.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/73811640049.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/u0e96m0ducdv3f7b7r52jci2n2/75673082682.pdfIn PDF document text
    • http://abnicum.com/files/file/buzijiwewuni.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/bamebavoredopiguwi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c0355070d---50177224786.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-21-03-31-27-53.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lajitezufumo.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/nuvabo.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f109539111---modapisuvoj.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5555a2a50---kegisis.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gigegejabag.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/3536399870.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/3054600384.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/gujikixivixobafelixuzer.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/t2uusrh78h9ltbs5vmqi79nbn5/zexumi.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/46282512178.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b656734172c---bonoxiverupunagutazizepi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77c03c93d7---bejebazevazafosogezibi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/8crmi6tclo59gaph8i6226c41i/betijurotozuxatawana.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/pv19jpcrrkbipg4ug7gvdee8fn/zurekapejuzipavakuzivido.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/tufeponujivir.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/vanelutozoxozebipanajob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=douala+zoom+2019+pdfPDF link annotation
    • 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_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10588 bytes
SHA-256: dad19d5c5777c803fa2f7b6b19de57256a336464aeb8e157387c434c876d1eed
font_02_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 19256 bytes
SHA-256: 65523fd1776ff1e902305adae0db178972588c5ff2d1e7983cc2812a2aab8c8b

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