Malicious PDF — malware analysis report

Static analysis result for SHA-256 4170dc08ded5c14b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 13:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e965327a8cb534311e5e115f50fc65c SHA-1: 524e9864da9c029c7e502a7c4f9b384ebd77cbc0 SHA-256: 4170dc08ded5c14b77a896b929ef5263246c9ed9f90f75f6ffae8c23ea4d03f2
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and links to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristic firings and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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://pistant.ru/uplcv?utm_term=rockwell+model+10+table+saw+manual PDF link annotation
    • https://aawyx.com/sites/default/imageuser/file/10710359038.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be5f5a67588---23357344167.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4e47q3647lae2k50j4b2ltsv20/29190691096.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/98562705586.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/24503146057.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/limidosuwemotemej.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/24639881840.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/ravar.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/81461261776.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bbc6a3a29---girozanofow.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/debiwefuzego.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/76080457298.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1629864889.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084b90b57e83---58248927170.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ca9ca80a0---luluvitifukuxajasanixo.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/zavofetupuxuvimowubir.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/32310384162.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/repom.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b5527202---garezamumisikuvosirezow.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9bd4a8ae---54908101625.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/91841550614.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/vuvatu.pdfIn PDF document text
    • http://humanlitech.com/files/files/51145105173.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3be170695d---85477959506.pdfIn PDF document text
    • 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_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 19948 bytes
SHA-256: 00efb5bb35b87050dbb91d1d0c63e7b1810dd4bb2b5104ad201a64288bff2064
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 10976 bytes
SHA-256: 563b4c327bdec403ad1f2a29bcc7bf75d2d143b277d2ded0f2234c37bef9de89

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