Malicious PDF — malware analysis report

Static analysis result for SHA-256 36df3d0d63256d08…

MALICIOUS

PDF

86.9 KB Created: 2021-08-02 13:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f7c84bdbbf1f705886da2c1afb0dbfa SHA-1: 52bfaa53427c9128fd3adb2cf8d728898b87912b SHA-256: 36df3d0d63256d084ec219aea0ba274a5ca00cc0621313e2384eea41278ff45d
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=medical+report+form+ghana+pdf PDF link annotation
    • https://langestrand.se/anvandarbilder/204/files/xotobujobavawojonojozomab.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/60427813270.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096837fdab90---38404465995.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/824ui391f203f6br0vku7he0dj/54722504616.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/25665089878.pdfIn PDF document text
    • https://altbuket.ru/files/13782436673.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b173e7ae9b---vazefe.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/pulovisexamit.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8d8ded17e18746c53fef74b4290c4fd6/77107841474.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/kaligamopafarisabod.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hvavcbkd6gfkvvsij1am8dbctb/48159786971.pdfIn PDF document text
    • http://amdind.com/userfiles/file/44986745412.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/4592277631.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/21949bc6eb2298a65a4290aa46716e26/wufekar.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hb8i8l5pat8nkc9jv7lbu3hv9b/sogusijepodorasowatugupi.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/korabezamabunulowipozar.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/68341251931.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/15a2c0bbdf699b16854d3c337e43d03f/67208608249.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/zizeseretok.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b725b1c8627---madimakov.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/57411602239.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/77316861022.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/guxatelujomemubeniwa.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_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 17188 bytes
SHA-256: c076945ae5ee7730cfa2a86117b05b7659fd65300fcb6cb63c77699770ae11b1
font_02_sfnt_off000134fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FD 10892 bytes
SHA-256: bd1b7d9bb6fc7e754c71417ec46173a14fb8f72bb3f70b3c3111d0619235d90d

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