Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa1c61c6156f401…

MALICIOUS

PDF

98.1 KB Created: 2021-09-06 08:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4165a6f1efdeae31357caecd4aa5f81 SHA-1: 6dec69eb1c27587e22ce10dcf1061e1db2d16176 SHA-256: cfa1c61c6156f4017f476add46895c9e88c2c6b46a0e180c8d1531faee719814
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pistant.ru/uplcv?utm_term=beach+volleyball+rules+pdf PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/08c76ebed98da57491216faa3afe784d/28600944943.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/26807968335.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/zunilepaxuvi.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/83362055178.pdfIn PDF document text
    • http://centrons.com/uploaded/file/780149886108726e0551f.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/kabonurexi.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/pazobuxudadewirel.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/pazupesogerosot.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2d988939def336e3494b405addf423a6/vewozet.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b096b95f42a---73872694602.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb770ec910---ratito.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a65edc1ad97c5bf1624b2d53d70aa546/kavapixofumenawawonu.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/siwipagowowokemepovawi.pdfIn PDF document text
    • http://ccadl.com/files/20210830190451.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/16888408355.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081fec308826---18023453289.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/gebibumazumix.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/86394174698.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/42813325570.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/12252612436.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/18042311511.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa07ee9cbc---31252555956.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/16153162723.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_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 17972 bytes
SHA-256: 4b7364a592f6b86b35b85a0e35fe023a0e036fb96caf64c2cdd4809d10c2cfd1
font_01_sfnt_off00014922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14922 10896 bytes
SHA-256: 1af42fbb01f320262ffd7f7e1d8f15eb933c6579991ec368c550a9416165bacf
font_02_sfnt_off00016254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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