Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6c850f151f8a80…

MALICIOUS

PDF

67.8 KB Created: 2021-09-07 01:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e3be89173f99649ac73d7ea3ed4dc37 SHA-1: 7ef516fca65676c7d54ff79bac716f2aa6964272 SHA-256: da6c850f151f8a803f422f400736ebd5b49880082e551199405f8da17dedb88c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of a link farm on potentially compromised CMS upload storage suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://se-ty.ru/uploads/userfiles/file/petileforukipozunezuxeda.pdf In PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/sexoxabovukuderam.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16098b204128fd---jirazabumabovevunepu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/tozatuboxi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/96730897563.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/rosituzibupu.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/reparupuzevikuj.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/87097337391.pdfIn PDF document text
    • http://waypl.pl/upload/File/32890103672.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/sigixorodewop.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/14907639239.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/23281268271.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34404abd74---zudikikupolusi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/52128423898.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/wipifamivixunedesa.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/39fl44krc0u7mparu40okepg39/90447206285.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/70388860944.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/71351391253.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/danifalusabu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/a1ndhhblpkhdaedovqhrbjasoe/vomevovugamijaz.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88ae8d934f---selapawake.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca57c4332a---nawajotavim.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/murewoxosivorevex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=brayton+cycle+calculation+pdfPDF 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_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 10712 bytes
SHA-256: fd8586e9b74bfea6bdbdeb4feb919d6dbb2853a21ae2635a579ebe1fe0f8dc88

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