Malicious PDF — malware analysis report

Static analysis result for SHA-256 b799ea5b22205f2d…

MALICIOUS

PDF

63.7 KB Created: 2021-09-13 12:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 515453dcc18ebfb1d2880b2bdfc47144 SHA-1: abb4c2e30cda510556790cdaed75ecffaca991a7 SHA-256: b799ea5b22205f2d5dd79e1c1f3c2fa245f9665ce4645f1fc96081d731ee6934
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various domains, some of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to external, potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8985

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 http://heyumpnd.com/userfiles/file///lajokutututuwedumev.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613048e0605ba---5658838866.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/98146089141.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/jupibepamegapona.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a18ee1ab615b8e1c2052c759f898365/vedonowabalap.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/5699816780.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/73205538126.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/90238043956.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5e6ae04b---zofemoxigapiti.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/puxeragupaj.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210911/file/16313487696082.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/22106372929.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/wuzinigivupunul.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/lixodekoraraze.pdfIn PDF document text
    • http://moristas.com/userfiles/files/97846608844.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/7645656604.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/natavobudarigub.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/gufikekefexetax.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/9094590548.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/tibinididiwokopad.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/74068391552.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/27010576788.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/85196781362.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/76721704588.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/mezupevibo.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210907_554B680F7CE95B27.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=imo+apps+2018PDF 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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 16836 bytes
SHA-256: 9770edac7b1ca5a146f260cfd9b600d585d78a1a0426cd96c2282716a0014c6f

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