Malicious PDF — malware analysis report

Static analysis result for SHA-256 8181013c8df31f9f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 22:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 320a02df1539f387a54229d8399a4a19 SHA-1: 3f5e41bc8424a81239daa6dd6fbb205607f8be43 SHA-256: 8181013c8df31f9f2ceea90940bc134f75ff895588079ff6e1e803d016c2d2f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=tablature+jazz+manouche+pdf PDF link annotation
    • https://purefeeling8.com/data/file/sisajudiboxosukevisepa.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab99a16b90---zoxapetutosepiduxevu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2aac003b---43956412600.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/rugelofutonedebux.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/mogajimopitop.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/86022485860.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/94564892785.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e2e6220d---46653550817.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bcc127c7d410f092feda37565d6d217/sokarid.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210820_D16228E41BE06EC0.pdfIn PDF document text
    • https://samowar.ch/upload/file/92599520582.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/299490dcf121162c350525cfdf9af797/39904352711.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/petizuvupojimorizizikux.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/52831940348.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/soxotopitarudumunuzonawos.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754fa480619---litewi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503155822942786.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/guzes.pdfIn PDF document text
    • http://modero.vn/upload/files/14699304228.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/97656c7db0bcb062bb64f86655c304e7/6202944301.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5fc12f38963dd34c3defc1119307ff78/40752614754.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/jolozenu.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/biratuli.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/94441105716.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/4524542409.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_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 11020 bytes
SHA-256: cb73223d4a3d9aac0cd9949485cb85ccb2cf5a245aecc0f4204c7b3f6e7bbb62
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 17716 bytes
SHA-256: 370153a2fa09d890e88b6dcf8b97c7334eb0e9a172e8017992241a72aaa8c466
font_02_sfnt_off0001320a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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