Malicious PDF — malware analysis report

Static analysis result for SHA-256 9643a572534d942e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 18:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad87129d122af8163d4d0ec617c6c7f5 SHA-1: 26c7b09b4dd8f515f0ef4d07ff04adf3ff5b18d7 SHA-256: 9643a572534d942ef6c363cc697ea5cea00a13a216c193d6f636e44b18433d84
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

Heuristics 5

  • 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
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0db1dc7edab6f120d243c2c2442b15f1/xobiji.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/19698566822.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/73704769909.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/36183670107.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210825140417.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/gufufoxugugaf.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/ginovatame.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rdopmbfqp8q0u4a4vsemb9qp3e/rujotozeselorap.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/damavufakanefibupevomo.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/59008939581.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/vebovefodovisurabugibuli.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/19331925175.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d9127a79c43ea3de5ecd77930f96f8c3/84619480826.pdfIn PDF document text
    • http://landpas.pl/upload/file/nuxetela.pdfIn PDF document text
    • https://mediaskills.rs//files/lofot.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/wafor.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620384663.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/31338992479.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/6tsna172nkhatr6p0ufe7f3cpc/21313967940.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e2862a664---60237708137.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/2t5noi95k3laik1n6n7kec6386/vovanuret.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/18623983044.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/30088219246.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/vesogexevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pdf+compressor+online+below+200kbPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 11084 bytes
SHA-256: 6944d564d3548cc257d81c3b98b7a651916cdce005f4ec6719af88a0ba688c17

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