Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd40130d2395b70d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 06:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60703a810e60936182e78524c18516a4 SHA-1: 868ef504bb3b3617a410eaa04dc968a7d50bc3e4 SHA-256: bd40130d2395b70d1698fa39b08cb318414d40d5b457fc96bb59fce4d9ac0d3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=modern+combat+4+zero+hour+apkfine PDF link annotation
    • https://sysyanginguvenlik.com/uploads/files/53211304650.pdfIn PDF document text
    • http://taociren.com/upload/file/210915073409953127z4dnufz0gr1l.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5cda90eb---sijufitisavolumajup.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/83401749090.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/rulonunekobu.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/93062380174.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3462e65964b25ffbd70998ac6647ae58/wesotokutikunuzedogaf.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/kuboduwepetekako.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/natuvamizadojorezubazifi.pdfIn PDF document text
    • http://zamgph.com/uploads/file/170759571805.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/venajum.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/munibuwolurezonadaki.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/munetozorigopibobiva.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/59942480778.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/mamimapefovimabasu.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/lijodorijavavokimetevuxox.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/57739854493.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/89515371919.pdfIn PDF document text
    • http://888chji.com/userfiles/files/97006341928.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137aeb17a723---mulaledunadaf.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tabedonunu.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/ludeworegetokamatumip.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348f89c261f---zanotabatategavose.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/legaxizavimer.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/zovazatu.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_off0000c965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC965 20868 bytes
SHA-256: 0c5c72d1ae0946ae818304bdae7a329ce732f156794b92cc028da1f796323a08
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 11132 bytes
SHA-256: e282d569f83d248285f43e4d1a8b4ec673c42e053f6fb9ec57116dda926ea968

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