Malicious PDF — malware analysis report

Static analysis result for SHA-256 9314be4c9c393ebb…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 04:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 446cfc4fb132a8c147a50f0da1516452 SHA-1: 523175d2b0d979f61e691d4b3e02d36b84904fe3 SHA-256: 9314be4c9c393ebbf33fe11c352f230fce536dc4062bfe79ea1570c0c2788f4d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://novussiteyonetimi.com/uploads/file/kapemunaribakodisagewa.pdf In PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/jegan.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba72a752ae2---60869052417.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3e6f8d37e3ad3732a172caa885d1e8b0/jupejinoduvexaxemarerasuw.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/90213397781.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fpdcl6g4hnq7rpobralm7ej6rh/lilijibariworuso.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/zetapenapotasora.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5vqj7mni2b5q6qi25ceqksrgeq/37481334379.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b674e98b49ffd50f57458a358e159f12/jizogatozosurifarixuze.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ahfq9er40ilvr1n746o8mqhm23/95353572796.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9498577fe---bufuzobuvirawixuwefij.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160760a11726d4---34019756582.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b2245fd4af8---lozuvu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e337e164---kabezilab.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/pokikabosifutenapid.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/97da4aed7e0f0e349b187664e13e7a9d/74004122552.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eebc6c1425---82909565131.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d57bfd2ba9f---vijawuwopevofuwesuvivuw.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/makodapaxales.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89c120e940---11940989069.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/58507434797.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/oaug9n7a1q2dnv2djmubrl9j1u/77979201112.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f597aaeb08---44649904185.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcc35c984e---46799789943.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/winotugudugezovufitiligej.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kt3ap3svnh9sq7r28fv19rmfg7/petatorukifupisupitefebug.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f1a2ece3e---64829650225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=school+policy+and+procedure+manualPDF 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_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16828 bytes
SHA-256: 6e2d4e7a48e2bcc3a31d5a3c0f1337bfe89340a6b9d256d240031fd4fd6ee2b4
font_01_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 10800 bytes
SHA-256: 8a4c98173e051d9c4d6cdcfae9ed3fcc058520966d6fd57a5be4480f75abc5d9
font_02_sfnt_off00013b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1