Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cd00e78eed788d…

MALICIOUS

PDF

76.6 KB Created: 2021-06-26 23:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5be443bac45f57a88faa9bb2c7adde38 SHA-1: 89070938d3b7a340d205855cf71afb35bac9acfd SHA-256: 85cd00e78eed788d12f9b7ec2ccdb7ffb034bd70601adff66aa2917aa89c954a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the presence of numerous links to potentially malicious or compromised domains suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://africanhairbraidingsalon.com/userfiles/file/13499058125.pdf
    • https://hyosungulf.com/uploads/file/rarasizudukotijepaj.pdf
    • http://okmarin.ru/userfiles/file/50891127053.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608548e65233d---vajiraginoge.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d92a74d7---mobituroxuzewox.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087feb27186e---94460362971.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6771c3523208dab5b153eabcd20b51b2/lewededewuzipivamu.pdf
    • http://planet-for-events.de/userfiles/file/feroridimenonazefavukeze.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbec131f43---tudivawezozizepuxan.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/08e96cfce92cdaadd26a83ea6b857b50/suzabowop.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/22027066613.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c4acbc0be---17780990495.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/op2rfvaa663lp14ir36latud26/xomorevelirufagivu.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744bdf7c24c---maselojuruminebipemozujip.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/40517cfd4f2e5d083d62aff8fa074ccb/sexumitopa.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c796c6e40bc---87825462346.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/34372594415.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1e1b422a---71561338622.pdf
    • http://olympusflights.com/files/files/59124337365.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef13b4fa84---zojibiden.pdf
    • http://esipro.lu/userfiles/file/36350396253.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082adf733b9e---vojojololuba.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0b754946a586f004eac92e0c1373b069/vojovelerafel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+do+you+see+first+pictures
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D1 16792 bytes
font_01_sfnt_off0000dee3.bin
d532e982146ba656cbd383ab9b42c138d087a0b19741d385bfd6b427445d1714		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 16600 bytes
font_02_sfnt_off00010a80.bin
d548f1f447449fa56170dd67d8066cd8b6df0cbfdaac2918a2518365c4838a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 10772 bytes

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