Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5690d31d813f7e…

MALICIOUS

PDF

108.4 KB Created: 2021-08-26 02:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ade60fc9d5f9e1727edae298e1c9b88b SHA-1: 811abd6386d282842f35faa5c2f6fab1ad0d8e68 SHA-256: 7c5690d31d813f7edffe65c692d240b65302565939c85be7def376f6ffdfd6de
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dc55e189e339062b063415e00dcde28d/41838401379.pdf In PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/muerep3h6hb346es09g5vc8vh0/14385007304.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096b23790241---53603927395.pdfIn PDF document text
    • https://hagepoorter.be/files/files/85895036006.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/33628735437.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/792f111fcbf02cfaa29ab658584296c2/fomevivenoxozuwivaregi.pdfIn PDF document text
    • http://bienbao.org/uploads/files/90548317375.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/94070577251.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/85620090362.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608527f410c67---zuwap.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/sanidisata.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/nenitijanadupevaxaxegeko.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/32708378810.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ta2sdef61unsatdkbiiei3ff13/37991133101.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b666bca0ef---86192960498.pdfIn PDF document text
    • http://partnercable.hu/files/farananabomureregumetela.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ickddb46cku1nbf76ad468i204/62810479220.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1e1d4eb6---mixeferevenevipezezo.pdfIn PDF document text
    • http://15881588.com/ckupload/files/felomebed.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/52652003971.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/rupus.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/33d49fa14e8e17ff3b971d6bf3371776/40587293179.pdfIn PDF document text
    • http://alvitraders.com/files/gajabomonope.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/64a81d954c38ea4c5638e9332bd3b1eb/82442232375.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/70699806559.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d2d92e4d5d805b516cd435cc691a5bea/japetawivepojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+many+laps+is+a+5000+meter+racePDF 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_off00013ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 19276 bytes
SHA-256: 7c51a302bc430cf793d05a2455c2ddc462b8904b896fca6c748229539b150fa9
font_01_sfnt_off00016f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001875d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1875D 10980 bytes
SHA-256: 59c8c1eef0486080fa5dd7c9c0c7aab421843a67ebc4a4c006fd4e93061f2646

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