Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a202bc8ca5e168…

MALICIOUS

PDF

76.3 KB Created: 2021-06-21 12:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d0401f7cbb1969c0da6478583d55372c SHA-1: 56e8da7343b473866c4648260192e1218b376009 SHA-256: a5a202bc8ca5e168653c4fd712b0b371654db6976835be573168bd24f4c2c176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to movie streaming, suggesting a lure to attract users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=lion+king+tamil+dubbed+movie+watch+online PDF link annotation
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1562182b---livojulojutovada.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ff46c988eb0fe2de8c984482b0225266/92583594065.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7b86e8fabba3f47f26dc279869fff721/61903147550.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/nedogofezova.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca365ea58d1---kelepolokabemupalage.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3fca96e74a6b3c9013fab92600560c88/8121753999.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/09d46915da77b9606a6d846b8b0b8d9f/55117738408.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/taviwi.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f889f6fde42ed54439bad35896e75a85/webibuvananoji.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vidunuko.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16227673193311.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc397338b9---93475047517.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ddce0c8d---zolinonunegepomavonokof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 5376 bytes
SHA-256: b7bee6ef5874be596c5c4e81e5d372a9dc6e0bdcebda5daa8814bc12950eb3ce
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 11864 bytes
SHA-256: a7c2cb1613c725020f485fa133771fd6889e9ed3dde547dffc22faa74d56a135

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