Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7a82abd218eeed…

MALICIOUS

PDF

87.3 KB Created: 2021-10-04 20:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f649f4af8c6e487a3de9c2d5e6236d0c SHA-1: 2cdc2763e7d0e2663978dee413eab61f1b9491ea SHA-256: af7a82abd218eeedef2972617255d8adf2c48ec7040a3020b22607d1806bde16
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://medvor.ru/uplcv?utm_term=use+of+exponents+and+powers+in+real+life PDF link annotation
    • http://www.neoneophytou.com/ckfinder/userfiles/files/77672903167.pdfIn PDF document text
    • http://btfa.tw/upload/files/rirodusumopugegomik.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021100106200873499.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/q4r9msrveevj4dm1b714kbsoqp/88888024815.pdfIn PDF document text
    • http://speckrepej.com/upload/file/vojurerumudapefuvos.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/madivorukibisu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/runixatoxujifimozos.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/84723192308.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326c94d5d7b---24458340357.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/42694047841.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f32baee14f---17981953249.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/789ffcf1a9c1667fe340e9e7d8dc0cb5/kelex.pdfIn PDF document text
    • http://expresskaliski.info/file/74375479445.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/74530022736.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/9324924566.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/57939571161.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/69775737073.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/7dccc37e3a6f01580024f31366775a9c/fakida.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147cf0fb35b7---4727054514.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/36689022686.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/xuxaximaso.pdfIn PDF document text
    • http://www.centralperdana.com/file/niguketajurusijo.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/16600021419.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/61518818108.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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 21736 bytes
SHA-256: a7378cb8dd687962b771d560c1f09990cfca96be7c56e3426c6d8091334af3ec
font_01_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13739 10684 bytes
SHA-256: 83364ddb9510c2344fdac2b3e06faa7bd4ae198c55b3c73c056b224f4dcf9b85

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