Malicious PDF — malware analysis report

Static analysis result for SHA-256 c354029fa1c6c383…

MALICIOUS

PDF

76.9 KB Created: 2021-08-15 03:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b80802180d6acd6fbb887512b72afffc SHA-1: 07cfe17411bfebe32eb8d8464dabc5a4118bfd8a SHA-256: c354029fa1c6c383a7a47ef0fe7d9d7ef8db3787e6e158f0bc333675e72579cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://surmounttravel.com/userfiles/files/kaxekaripor.pdf In PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c9b1de42ccbf3d1046a8a77d72fb6914/85821399506.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/25895274860.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/jebosifidorexawixomefa.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/siwudatejuv.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac083a602---voxeto.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/acc10b82135e9c2440ed1c2c012b314c/41665146564.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168f5836ad6---ravinomedibizit.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/af91dcda20a116b068fc62e6efd3f277/mupawoxexu.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/xixaxanix.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16081a2bae69c3---81600711274.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0cfaaa0f386d5de0faad4d2609cd5765/89597416788.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/25595542660.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/95902716237.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/niwupufagabe.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4496aa3c40e32af40a1b287dfdf7d99d/43553626620.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/wunitamatebaverosugumo.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/39763854246.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/aa0854972637d36b3e9f9a4c5bd2e451/5432706823.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608132e08be96---mononininivedepilovufeguf.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/gidafinaf.pdfIn PDF document text
    • http://pronobile.de/catalog/file/99351321031.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/26154683914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=benim+hocam+vatanda%C5%9Fl%C4%B1k+ders+notlar%C4%B1+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 18032 bytes
SHA-256: 8a04368c2048eeeaeb8818429ee7cc8ce36fb3c183a78ac03cc0471075a92ffd
font_02_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 11384 bytes
SHA-256: ba9636db61d9d345dc91f635edcc764bacbaa57d10fed829998caf3b947b0165

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