Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a732e6fee9e970…

MALICIOUS

PDF

88.0 KB Created: 2021-08-11 17:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3b66ec9979fe22e85010e9a3cd04c61e SHA-1: 03b5223b4d1200a99e1f6846f8c9a0315f44338b SHA-256: 85a732e6fee9e9705629bd2def87cb9ae661039002a8fa9f72fdde30600d9b1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery through these redirected links. The presence of JavaScript suggests potential for further exploitation or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=how+to+pair+mpow+m5+pro+bluetooth+headset PDF link annotation
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c51c4af04---88244244156.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/v6amu634n8amd15mm7359cb6k0/63052073578.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/90463026549.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/javiwafopigop.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077221c6af51---gebaga.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/jutolesawuvapewuzirisol.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/topolodadarav.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/29472754901.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985a720beed---sojojaviwunagoweja.pdfIn PDF document text
    • https://ambalatender.com/upload/files/4498879473.pdfIn PDF document text
    • https://nexusmediation.nl/files/40414932161.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c18412439---butijetuf.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/718778d6eebd576f8ade90dbdbbb8328/jerupelagowos.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087a7f62c806---wixonez.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608874e0aaf0c---javekiwoledupagexivolo.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/bototugobap.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/64871214695.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4bd1615058f6b2105b3a43e22c6dd545/9585592516.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a24fa49b3---64128553459.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/89396514839.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb154f2d1d---1316282197.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ec185eaf30bc4b81210783a55e5e7d60/tulemisanareb.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210629071457_ol7900.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ec974aa08a0f4655a7580f009cd80c90/27263611041.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/78681445950.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/mazusawunum.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/35034603448.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_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 11004 bytes
SHA-256: ba60d1aa6eabaa1fd3b0d7a1e04ede7ecb3e17dbec8654021474fa9c57abaffc
font_01_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 17684 bytes
SHA-256: 93dd6c0b3f1074a3336d424cd23cc01fb5674bec18777c0f04f8ca89cac51d24
font_02_sfnt_off000139ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1