Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5e7d7b6917b1ae…

MALICIOUS

PDF

85.6 KB Created: 2021-08-22 05:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 061815c2bde0b546b027dcf6f1335b74 SHA-1: 4d96a2c1278eeb21cd279987f6ce3233ae566827 SHA-256: cd5e7d7b6917b1aebdcf5ef056457bbcd00440c912932b3dffda944dbfb177ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators points towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://computerdoki.hu/user/file/55108293993.pdf In PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/fisepefobotudi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f567a883---9917743125.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160743ba5c848c---zitupadixugetebepeniz.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/botoxumowunoroxejofurobuj.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/lazofikefatajewolab.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/67233413932.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sexovibegijejixirev.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/29079288847.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80335e52e3---70165962734.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160738ffe4dc40---bububeduzekezusir.pdfIn PDF document text
    • https://blokhol.com/upload/files/rokuregesokigitadotidu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/olr4ul0l669nf5o218ui2t96mg/wuwovojopazoniwuk.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/80784213880.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/78034904340.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a476f756fcf---56080154205.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c1549406837804720ef30eb5b7beb1a4/61211228383.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/tixujunalo.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/jisudovijelitimeloroninu.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/batovejexirenanofofibo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/h8fkhbfkqlojdvo53dc56l4bbh/xisutu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7c7551df5f7feaa641a1139c2e762107/82732555902.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7237d0371a---jozuzalera.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/46952002575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=safety+features+in+anaesthesia+machine+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_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 11008 bytes
SHA-256: 2cb5d37f094c1abf9a2f18dcfb02aadf112013dfa3711fd308061ae9eba4c9a5
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 16560 bytes
SHA-256: f1d8afd9fb3d9be6ee13dba2f6c5c2218573f0878196b39e2a3a2c191e19f1a7
font_02_sfnt_off00012f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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