Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62af95fbae7cf2f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 04:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ca4002661a55f25d6cd3d9ec58cb8a6 SHA-1: c0a9de44e404dcdd2ff45459f42c68ca874a9452 SHA-256: c62af95fbae7cf2fc090249a740a282e9768fe2d1d8222c593459579b381b15d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ketchas.ru/uplcv?utm_term=transportation+problems+and+solutions+pdf PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/514ac590f152f63ba4f07fc5fc204af6/fegekemenezonejuz.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099820719672---23865639893.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/131558546248.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/h22rlc99aoo70bpamb6ssasiha/82029523528.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-15/20210515195747398720.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tegvj3lu3152fv9dnepjkkcd48/nololemilitugaputefago.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/57865975599.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/kepazesagilojawiwudijuba.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/37484904323.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/dowetibolizuxalofa.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/22611063411.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/xuvekasolenimumupe.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/8kpmimfpduouhokcrhto6ve2mn/xodoxibarozajefageni.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210704_084352.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/labejojowuwefom.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/dujetapewexujadox.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/95285892383.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/59175088114.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/kasixo.pdfIn PDF document text
    • http://askort.pl/Upload/file/xokonetidujubipox.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/df80beede0c904d5ef790f27e675a627/jakulapeboriponarisam.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fc156908c9c196273411e6b6d61951b1/90675036412.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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 10864 bytes
SHA-256: 30b6efed710f29d4fc158c6251d552115b165469818df961e87905054595805e
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 18140 bytes
SHA-256: 9c8b714627768cc594a5d5521b5d91960467da8f8ee187865a2624487eb2ea86

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