Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc85dcd75d8ddde1…

MALICIOUS

PDF

94.4 KB Created: 2021-09-08 12:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 48971d2d02f00fcdeaf8920b30c2020e SHA-1: aaeb0771153a6ebbee93e552b8680388d0690d8e SHA-256: cc85dcd75d8ddde1f231d714a5fd2ec9190f61544ee51d563d128b6d35347892
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The file functions as a link farm, containing numerous embedded URLs that point to various domains, some of which are associated with compromised CMS uploads or appear to be disposable hosting. These links likely serve to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mikomisushi.com/uploads/files/51833919548.pdf In PDF document text
    • https://tanthueviet.vn/img_data/files/88195524445.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/wategapeveramodoriviwa.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/16932542678.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/29ac52bd29461ffd81422f9b65db1d8d/44582007211.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/refibataboluzu.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/gupemikuxa.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/85696116661.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/12884944095.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/givusigo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf39f3ab7---todibusesifusawiwulukof.pdfIn PDF document text
    • https://campermagazine.tv/public/file/19482547907.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/14243220358.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dbb41cce5160d6d33a170110de2c9ee8/84879395275.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/45820542483.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/modidefujadarozoraj.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b230920fb---40845871064.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/342089657.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132af323d2e1---lejalegugenonib.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/79209442507.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108230423342847.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/93fecda6723589df8f403a201b33d986/radop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5293ed49a---44154554767.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098953358956---22162422685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dsm+5+pdf+substance+use+disorderPDF 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_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 11108 bytes
SHA-256: 68eff9f8fcf2326fee2e08033190045430aca2ba8a6d5579464978ca66b35436
font_01_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD7 18688 bytes
SHA-256: d124f332d05536c8a87464700a95251bcb65a8bdfbdedf28b2d46a231d6d94d4

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