Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0151d660c793787…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 18:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6fe801b958aa0af2c301c65e4fd85d80 SHA-1: 61ed83bd69c48003145ab064651a603f4ad0352d SHA-256: c0151d660c793787b1f698f11a01cd0d867535053c3a8995b00e875e724aae33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate the PDF is part of a link farm, directing users to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://linhquan-group.com/upload/ck/files/mimuzezekujed.pdf In PDF document text
    • https://angem.fr/userfiles/file/pakezovuxolevulusilituje.pdfIn PDF document text
    • http://greenglobepms.com/uploads/monomunizeturanozexupep.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/jaboronowanabofu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/607a03f3e06b1df7e90948618606a187/linifi.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/77634951442.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/guvuseduxodotopizigutebu.pdfIn PDF document text
    • http://vaithun.net/upload/files/51230998839.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/zozotazaralerizexitevi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fd85940e3a8cc2909ebbb758f4954393/1608089885.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427f25a20f6---gabirapax.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87f76c5e8---29253196194.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/70431301493.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161401474c5039---xovafaripuwilubu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613503e326ff0---zixulifiriwigevul.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/61842895089.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d594084cc---kiranuba.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/29103506762.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16143ede7960c1---nevinov.pdfIn PDF document text
    • http://videlec.be/ressource/file/jolesabujirovasijor.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/67052492778.pdfIn PDF document text
    • https://wrd13.com/force/file/sarifazalaxezevodala.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/fuzezozakozam.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/66944720165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=data+structures+and+algorithms+in+c%2B%2B+solution+manual+pdfPDF 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_off0000b32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32A 11168 bytes
SHA-256: 6765478776d7e7c91a5e91e901f2be7c288c831cee58fa6cc88d51a79ad0d36d
font_01_sfnt_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 15764 bytes
SHA-256: 6c0fc3fefb6fe4997f683abb249268c243b91fb3e91486ce17be769e43ace29c
font_02_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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