Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9c1fe7c845f5f9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 20:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cbad08e607a3c0ec867d03e4d03ea3ef SHA-1: 593d90d43b3b21c5dd6e6e6c800554641ea6c2fd SHA-256: ad9c1fe7c845f5f939a2f9536e5d3a12852e1b5ba2239ed8b175698ef9637ad3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the true destination or to leverage SEO for visibility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oncetrabzon.com/resimler/files/4318647178.pdf In PDF document text
    • https://bitree.com/ckfinder/userfiles/files/tegariwepaxupokijuzobogef.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/pepukawoxoxetosotuzudepik.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/21666152136.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca3e95763---vubuwolobeluge.pdfIn PDF document text
    • http://usmleworkout.com/files/file/loxamolasutuwodoz.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4bceab93---dojogofikenudaketelab.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/66887847248.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/97445518748.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/texizerizavuzubof.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607086d9babdb---84548707060.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a0d2482917bde511c5d7662cc25b4154/gevoxuxuxorenanebet.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/jufamod.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/kisabifezi.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/49178533891.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/v8sqlu360ar1sf7mc1kllb9uqs/kubefisomubufodupagonupol.pdfIn PDF document text
    • https://rjpexport.com/files/xurekiduvokopapijadup.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/wawegixugokarekisazazat.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7aa2da1dbbd235d19c0b1193a79e7732/17664553039.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/6964110653.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955654cf1d3---lobupusavuvuf.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616ef336ab---tiruwogizetebuv.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/28d9d9da9340a3092f79d378fb7b588d/38287656378.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8bf2adba88d8d014396f1adf7e6aaf10/xibebixanuginusugez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=california+front+license+platePDF link annotation
    • 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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 10504 bytes
SHA-256: 669ffcf64202bed56332605647ca1cb73f0d336708287be2135e145e486c3e44
font_02_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 17032 bytes
SHA-256: ae6a8ee0347c1f4d5b9451694726928d69741896e6434b17eb290a1f3f9cbe4b