Malicious PDF — malware analysis report

Static analysis result for SHA-256 4606e480bb4a87f5…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 14:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9a83f17bc5981f74b0ddfae266746d4 SHA-1: 01a09a02215e7affa969e950ff945fd377bc2382 SHA-256: 4606e480bb4a87f5c66181f73e084c9f38b6c928dedc2b620d3431e24e0372ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to lure users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bodybybodyology.com/ckfinder/userfiles/files/8603672446.pdf In PDF document text
    • http://se-ty.ru/uploads/userfiles/file/laxexu.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/tunusakubukedekotaveg.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/poxar.pdfIn PDF document text
    • http://armanetti.com/images/84090534623.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140a41b32d48---mogebam.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/95392916004.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/17816470958.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/33873008647.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0b47f767---nebopatafoxife.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/94454654282.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/6810335617.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/siworirejomejo.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/sitomejis.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/voloxebigutaxalejojiz.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75908c52e---91410163199.pdfIn PDF document text
    • https://patc.fr/imagesfile/42004156239.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/jejufakazija.pdfIn PDF document text
    • http://atrsara.ir/resource/files/zofanupevisagolavakibe.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/bavafipugomipiz.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-10/20210910040422709853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=obd+car+scanner+pro+apkPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/46731153778.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_off0000bb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB12 20552 bytes
SHA-256: bcedf67375b898fc1a4625cc224c4af783fd8e5444376cf50f2552c34430d392
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 10528 bytes
SHA-256: 0fa96a409643f5d0e05b34955689e57ea8162babcf572dd2c683c9e108529b1d

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