Malicious PDF — malware analysis report

Static analysis result for SHA-256 1883bd17023f32b4…

MALICIOUS

PDF

67.5 KB Created: 2021-09-01 21:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8472ffb2afff2b0eed53b44bec1b9f47 SHA-1: a83f979f74e91632c40bcf9c684350d6af66d084 SHA-256: 1883bd17023f32b417f9eb9c55b8af7565f0852be081a1aaa5726cf6d591c88c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The primary function seems to be redirecting users to potentially malicious content or for SEO spam, rather than executing a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/10201d65dabf6ed2b0075c54a7998f92/77135035273.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/787e975cd1b8d7ddc844d1e159341ea0/kapowegepuresepejep.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/19749091075.pdfIn PDF document text
    • https://harom.ro/files/file/62612904115.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/toligisemelexavitalanim.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807aa7b9a35---62354488434.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bb685ca704c760d3db79ffd920d97516/406907614.pdfIn PDF document text
    • http://didopack.com/files/38791340794.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13386448198.pdfIn PDF document text
    • http://ned.ru/uploads/files/67601872914.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/lizawujasafida.pdfIn PDF document text
    • https://petala.gr/userfiles/file/jisaguroranubakadu.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/vovukisumawogi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9718d729f7a1d99d16b3ac60035d0a33/difimuf.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/15168431000.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4769dc2b---nunaneb.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/47564960194.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9pi742ncdfmr28vnj5qpsu04oa/34000808646.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/60e46ffee0445e3792a333c308d86876/61263285088.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/49532072878.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608497242ed5c---fekurazifapapij.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/dabubameremudinu.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/27348123050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mohave+county+taxesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC135 17192 bytes
SHA-256: 72ae75e44469bdc30155d372358b02ba245e3ae5086c50cc77ec5c463bb63b66
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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