Malicious PDF — malware analysis report

Static analysis result for SHA-256 916bc778d2cba63d…

MALICIOUS

PDF

79.6 KB Created: 2021-08-11 15:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ba2508e97c5fc03c4ec3c1f439bad6f SHA-1: 57644c1df7fd78bab6f8d4c9e0a776f1ecf44789 SHA-256: 916bc778d2cba63d3bd99c708976e1a34022edcd1bf9543bd2f1c8c7c49a944d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

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://catamma.ru/uplcv?utm_term=gameboy+case+for+iphone+12+pro+max PDF link annotation
    • http://www.pattyn360.com/upload/forum/files/18861625981.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/96950687841.pdfIn PDF document text
    • https://33mobility.net/uploads/files/senopanog.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/93927204095.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/degatudapinanetute.pdfIn PDF document text
    • https://etimes.mn/uploads/files/babakipamad.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/vekaligoditejap.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/94504774236.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afac0d6162a---faxotodaj.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/16211807058.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ade678048ab5426e80241e833ace7f93/resolekaf.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da398f9d566---50792445114.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/luwisefo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4971c30a29---pirexiwi.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/95472332355.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/c0oalb24lmf13q7vijdb5o5l3b/15229537442.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/32368172964.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/moleba.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd6001095---bokagikamisafikoka.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/1cafcf013597d67394033928650f2fb4/rivulixijixolipej.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78c66dc160---70169221429.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc312e41c3---4104724999.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/vataxugorovotewaridefon.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/vupapuxipijuriwuve.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_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 11168 bytes
SHA-256: fecc434eff12c056c810f34a6a5189c5b328050f2fd003c0feff5b46b87247ba
font_01_sfnt_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 17272 bytes
SHA-256: 1411d419122631f4a09f443e744526ae8fe072039076817ad242ae8e770c3692
font_02_sfnt_off0001192c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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