Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cb42d5f412d75b…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 07:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96d2a4e60a074b612cf1eec8241ea092 SHA-1: 17a8bca197370719b65c31f86eb20807cc5f41b0 SHA-256: d4cb42d5f412d75b5c06b2be5a3977ba8bfdc752d4fad42037619cf7fc701ee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=willingness+to+cooperate
    • http://omegapizza.net/uploads/files/jodopus.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e17c2ffae---luridukarexasojirevo.pdf
    • http://farmaciafici.com/userfiles/files/80730482323.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/nuvobibikanenuzuwubusaf.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a288997bba---46248359046.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d9e57cb33f4f2d158e3b37d8bc3d2a83/tuwuxoxonala.pdf
    • http://qtjdb.com/UploadFile/2021/06/21/file/20210621_095029_178.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbdcd1fb57---zupasi.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ab554f58---fawavoligasefinuxisi.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/30196576276.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c44ac8e2fb---kokosekozuvavedaki.pdf
    • http://sbstroy53.ru/img/files/xuvevozomilojunejumok.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/424b0133f5428f37d8420ac634cb59a9/xigexofawavevufemazux.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72ff321e6---nuvevivuxisewozob.pdf
    • http://messtores.ca/fck_user_files/file/92011965000.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/557d9ecfffa9705a9261ed5824c1de1b/82478576409.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018e933637---27464865629.pdf
    • https://cape-electronics.com/media/file/fafiruribaponen.pdf
    • http://acpiindia.com/userfiles/file/68651631547.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c25a9ad49ef7f244950744d092ff6150/fejemikurukubaz.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/favogojogulo.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074f735f37ff---kumeravupor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1f.bin
acc6ed1fd94d6f99e6c959a84a9e0aa7eced769306442bcbc4bcbe138caa8f70
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 10540 bytes
font_01_sfnt_off00010246.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 16792 bytes
font_02_sfnt_off00011a58.bin
fccb48884babd2deea426ae51ef1f967a55b99f70c271e902e8931121f1284e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 17208 bytes