Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7d8ef176aae26b…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 20:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fa266d7f7b8613954169a9039ff85da SHA-1: a4b9eed3ee78eb47de375763c58e90acc8268b97 SHA-256: da7d8ef176aae26b79e06c59be7037900b56386591a3f820c4b57f287d950e17
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure as a link farm suggests an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/dd6161290bb19584bfcf14d8bb9788b0/sabefizimuj.pdf In PDF document text
    • https://bbgpiti.com/userfiles/files/dajofaxefikonuzoxag.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6eb427affba2670152d245cc370efa72/73421369773.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/rilunupemokibop.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/puliwujapadamivuvosised.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ecb643469c96fcf36eb50355be0bbc46/giduwa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e275531fc8018b688f5e074a05e46db/suvalusaxuselasameg.pdfIn PDF document text
    • http://vhz.cz/user-files/45008169008.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160da1ed131074---82281644370.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/16c1887af07f99f05bf7f52e6fabaf1b/42559683322.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084679b38155---sexubufun.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/ridolokogidunoredet.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607844f670dc0---35415391388.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c79aac69fc91eb43ade7b0781e93a4d6/dofegexuzevorevawaradot.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/g3o8s234vf90s0kmo7digcpoam/rofabazukejosotizoj.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7409323a---49724446747.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d243d15f6.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/fafesotibotuzos.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf27fde335---93415749080.pdfIn PDF document text
    • https://roc.mn/uploads/files/vemifisomigezumasuro.pdfIn PDF document text
    • http://intersonik.eu/upload/files/perel.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bf84c30a07cbeb1b6a414dd83ff24b9f/xawobotejabakukinaser.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/66227776663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=centrifugal+pump+catalog+pdfPDF 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_off0000bd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 10928 bytes
SHA-256: 1c78d9fa713abbee6a7480e3a78b7f3e84fda7206c671772576fdc2f12121d2a
font_02_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 15984 bytes
SHA-256: eefa24e89124593fed19ba165f147cbd97b439aa6f250f7d733fe79354c42a57

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