Malicious PDF — malware analysis report

Static analysis result for SHA-256 37102ef586f2896f…

MALICIOUS

PDF

87.7 KB Created: 2021-09-04 16:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8739169c2662380151bc7d458e909612 SHA-1: 9a5106225db70f5098e83709eb6fb9c51ccf46b3 SHA-256: 37102ef586f2896f73ec2a5aa55d821c01a64a299c0087ae07b05f9045611de0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • 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 http://sun-green.de/ckfinder/userfiles/files/91747162304.pdf
    • https://dbjadow.pl/attachments/file/wixoni.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/69038133629.pdf
    • http://newworldss.com/uploads/file/15716155059.pdf
    • http://aarogyamedico.com/userfiles/file/83944191728.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d9930444d---dukugaluzabos.pdf
    • http://mcenterdk.ru/fck_editor_files/files/78167525148.pdf
    • http://douzonebnf.com/upload/file///jetefafobevafolisibobofo.pdf
    • http://alanaf.ru/userfiles/files/64304175054.pdf
    • https://yellowstonewildlife.com/78988194707.pdf
    • http://grandrosso.com/js/upload/files/95642860811.pdf
    • https://srmhomes.com/images/bulk_images/files/gafomiledaporib.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a8c5a6567ug6rjn28v8nda9o6/40499404234.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/04fa87528d2ea13a62b4a78012ce6f2f/fofamaxavorasusisadijeja.pdf
    • http://asbufestival.com/uploads/FCK_files/file/55084171712.pdf
    • http://www.rajpuc.pl/pics/file/lavewoxip.pdf
    • https://hirurgija.me//files/bilenazulumexiludibolu.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/1rgsqmghao2i2qo9t8jmvrmo41/93640302251.pdf
    • https://cdmsig2.com/ckfinder/userfiles/files/5071390299.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc98b4bbc7---76033385169.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799afac46e4---25532183476.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=quiste+glandula+de+bartolino+pdf
    • 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_off0000eae4.bin
92e63f4dda83dfc8da5680626ca104bce6447bad7a409e4c74374405b797aabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 20604 bytes
font_01_sfnt_off00012021.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16792 bytes
font_02_sfnt_off00013838.bin
f7d6bb68487cb8f54b8e3adff8fe6f452230a8fc5d28f2795b3d0e1a86c42761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13838 10972 bytes

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