Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc97991d66e0f18a…

MALICIOUS

PDF

63.8 KB Created: 2021-09-15 14:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35148358e4f3c6ba9ba02dc67e851a69 SHA-1: 9ca35ae148337da777f6f6bf846a28685a547ae5 SHA-256: fc97991d66e0f18ad61ca4e77f7d6e76eeb608e84f253c577e2d48cd2420557a
194 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised. The heuristic firings indicate a link farm strategy, potentially for SEO poisoning or to distribute further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of a trojanized payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

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://newbusan.net/FileData/ckfinder/files/20210909_667EEDAE4350418A.pdf In PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/12215507810.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/37507834830.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7cb114d5eac9235351896338aaea9867/kafukosajefoluxawijuw.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/64237695304.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f7aa3644e7f87b2cecf75cc7fff300fa/91388204554.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/17283232807.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/6823109191.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/5171850132.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d50e896ca---wuzegelibaxuzuwatob.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/51896740668.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1e9c0dda---83855590639.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/39758480993.pdfIn PDF document text
    • https://europartner2.pl/uploads/20770525957.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/gidobokerufefasiv.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/dubapipakakefadov.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/pasakomiruburunuxenudoz.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109140605301267.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/99572748988.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/68680199535.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/25132998847.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/65277277966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wendy+shay+new+songPDF 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_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 10384 bytes
SHA-256: 21af88d134f1e199e02eb18d48354eaa6fbcfdf0a48c789296bb0397bdfdacfc

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