Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bf8ececd38bd72…

MALICIOUS

PDF

88.8 KB Created: 2021-09-04 05:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0d12b9b614256e8196a36ca36e02fe1 SHA-1: ce012a4727cdc389d0c690bb0ffc4ac0cc858d4a SHA-256: 67bf8ececd38bd72bc1db47b97a7aea4c49f592e7b57263a6984de659caf7d13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing malicious content or conducting phishing attacks. Heuristics indicate these links point to compromised CMS upload storage and disposable hosting, increasing the likelihood of malicious intent. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely acting as a lure to a secondary payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606def45b8bd1---96810487557.pdf In PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/tafezijun.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f8b14449---83403986609.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/95e0e333d9cd2c179c208fd2a58c1949/zelelop.pdfIn PDF document text
    • http://vo23.ru/upload/file/52317383458.pdfIn PDF document text
    • http://dogable.de/userfiles/file/55825592083.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/35610905677.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xapokukeguzolipadi.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/domajizozofiwo.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/95601447202.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06efbc36c---nonazodirufisuvezet.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/34803599022.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rsa9nh3dop5eb5km58mju2qoi7/34080786760.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/surotitizefadupopijibisa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608672bed40be---76056512956.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mv7mf1jjkk0dooqn3hdelp41ag/muzam.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kelasenejexubudevaxomisak.pdfIn PDF document text
    • http://kccmaul.com/files/files/21034879759.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160774da6997cd---lexoburelokokoxivu.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/qepkrf9ti7pcb4fhttooc2hq9c/56707050363.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82b18a29e05518384668361d2cec2eb6/botelufi.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/97517204438.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/f1aiu4juihernh66q4lbl3m4vv/85055131805.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/77244688058.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/53204127971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=3+phase+induction+generator+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_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 19708 bytes
SHA-256: 27fc1bbda05776147b958b2fcd13324c15b1d14eb47f9ffd13d1429293d5b304
font_01_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 11028 bytes
SHA-256: 790fb83f1bb8f2bc0ac039e072e1d83d252bf2ea6e6f975be1f2a561ce85be79

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