Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f461e486bcbb7c…

MALICIOUS

PDF

91.5 KB Created: 2021-09-17 14:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 48587a6259b56ec8f40ea81346d41d60 SHA-1: b723a064f32c3c82c04eb6b3b7b262e684e39513 SHA-256: 16f461e486bcbb7c4453c487d1f1e409166dc0600380c893d030107a5e43c297
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various websites. Some of these URLs are hosted on compromised CMS upload directories, suggesting a tactic to obscure the true malicious intent or leverage existing infrastructure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4066

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://lokalsport.no/userfiles/file/milel.pdf In PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/solunifidi.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/gubinarivorugogimuvu.pdfIn PDF document text
    • http://sbcnepal.com/images/file/62202842463.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/36791912870.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/gonifax.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/jufidiwidezezamex.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/20863890635.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/89447646904.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/53574851752.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/25076669579.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351f79c7874---tatoxagefaxum.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/83859735599.pdfIn PDF document text
    • https://signika.pl/Upload/file/71913392387.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd0ddf6d9---wupifikikamasobe.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/vopepajar.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210906162052.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161428cf5f1421---28691017301.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/lofuxudagak.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/46533157111.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/xafifosarubafunisul.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/18717219774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+photo+touch+up+app+androidPDF 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_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13159 10720 bytes
SHA-256: 0a4bda5810e17b9c9fd5b4b2340b7d8152dd139ae9bf5436e075959dd6f6bb85

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