Malicious PDF — malware analysis report

Static analysis result for SHA-256 739a4f5234101303…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 22:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cd0b6ae9f2ff9e31687e93e357d2a59 SHA-1: 106bdab916db2c2d9bae305019d49f56de74879c SHA-256: 739a4f52341013036a6ceee92547cc291a30713d90a0d08eda7db22e0c234dae
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tamlaproject.com/userData/board/file/babozutogigijipemejivite.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lbhqf1rbqjvs0mmlhgqigr8du0/9272663156.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd894d2e06a---mapepesinadegodo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f8c876a7ba06ab4ff5c1984eab3ffe61/mupoxoxevowelekunod.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b901b85bd---lifawifunutajozu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dewidositinojoxuwerun.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/19063a6d98139b667000554e580404e7/venugutedigixe.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab2d9e0bef---kuxuruvekud.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/fidozetitedesow.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/vilenesa.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-19/20210619121209309119.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/betutibakuxovanifiteb.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/69956033836.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/kawegezo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tvao0ignbnvoa5vki2m81ffq99/tufezemuvujusetanoxis.pdfIn PDF document text
    • https://cityface.cz/res/file/30706173554.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079304a6b206---14467181426.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/revun.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cc79cbc6357963d702a559dc3e6c5897/gegodixepi.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/65832622074.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de0680ab9---gobibebilulevinudadade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=escribir+en+pdf+ipad+proPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 18140 bytes
SHA-256: 6532b99c264730ab66a008679644a3a0c8afe503a7bef1f0433cbc30a8045fff
font_02_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 10592 bytes
SHA-256: a5ab28e58ef666522dbb8ffc5f423d0ae60664bad7f3f93a22cb0e47bd5f78e1

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