Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bb527de9da13e5…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 13:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a147182eaf06ab8a9c7a77735a988de SHA-1: a226506bfdd37d6911259d13af64c3b3a661eefc SHA-256: e4bb527de9da13e5a6952d8937bf652ada9820b2c6a112a6dfb72d25825593c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=free+downloadable+maps+for+android PDF link annotation
    • https://efsanepin.com/calisma2/files/uploads/34962702194.pdfIn PDF document text
    • http://krossi.ru/images/content/files/76308864130.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/efce06aabc027908ff03ead1df914d30/89536842050.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/vigalo.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/nifowinezoxuwokanexo.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/jidaxixibiroz.pdfIn PDF document text
    • http://langyupharm.com/upload/files/62591778387.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/derefepugomikuwimo.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/dekiwesu.pdfIn PDF document text
    • http://dothi.info/images/files/bawirikesufoxikotomumokof.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a5635e5e---55240969217.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/38508704342.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/5767691633.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/napalivumumipemizewarixuz.pdfIn PDF document text
    • http://zenkatsu.dk/files/45850017452.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/bumifakikegana.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6797ca47---fizidijafizipoju.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/10612035759.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/95650344561.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bowuvezinowuxedese.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9d1f16bd---zutotora.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/pejesukopuzitowawasozup.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/bamiwabupiwuboxifike.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_off0000b621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB621 10764 bytes
SHA-256: a8a38ea49cb22fcebbb72d59021a6493250a5ca869f896646bfeb930cabda86a
font_01_sfnt_off0000ce9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 15388 bytes
SHA-256: a3f74e27a33c0aee10f7daf9215f78faa1720a6782e32594b9c18f46b16252a9
font_02_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1