Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b100a63d347e7b2…

MALICIOUS

PDF

98.0 KB Created: 2021-07-05 14:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dc9468862034796348f12a85b03228c SHA-1: d0f6d43ecf197fc86cb08ea85861f2c128c98eda SHA-256: 6b100a63d347e7b2ff4908cd5574a3dbeaa9c11be86f42d94ff496fbbecfcad1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=street+quotes+for+instagram
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c65c0b8c75a---latetakopojajalol.pdf
    • http://www.findvoters.com/userfiles/file/94505522864.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8d6c95bb21d978ddbf82390cabc7fc69/33053680967.pdf
    • http://klccpa.com/userfiles/file/getiwo.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/cgnluvhflc12cu8edo1msq93c7/52238657101.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/48ee57ddf89f94d5949710c928199e9f/68950258687.pdf
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/faluvixesajoxanonijope.pdf
    • http://archinfo.ru/uploads/file/zanesisutax.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/lalupopo.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/45314722122.pdf
    • https://maxflowfans.com/userfiles/file/lejiwefagajajota.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f08050adf13562dfb2fd00e3f34b47d3/21869842979.pdf
    • https://callalilyvn.com/upload/files/mixixisugomezopuv.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b582b81ef47---jozonefesevowewinimemigu.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e638b6562b---48128558043.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be1ea81df06---67542388387.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1ab99ee9---risudazisaxevopemazega.pdf
    • http://jp-photo.cz/soubory/files/57734462618.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a4a02adb---73236051202.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16089679a62fda---31055712502.pdf
    • http://quickvideo.nl/userfiles/file/buronireginidivutedetu.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93fd4b957---7703333595.pdf
    • https://arte-salon.ru/upload_picture/pawetujokejo.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b99cbf1385---sorate.pdf
    • https://fwullong.com/upfiles/editor/files/paxiludowazuzetijenom.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090542c4d643---86309222944.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f5.bin
613737e3064ca1af4dae0a35035d56f0ffaf3d17b94a1465445d94d6e3a1ea3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 18044 bytes
font_01_sfnt_off00013164.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 16792 bytes
font_02_sfnt_off0001497b.bin
6be15bcd92a774427e570e1d8e2dbda25fa7d93dbb5b8b339746276d8c564e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1497B 10832 bytes
font_03_sfnt_off00016223.bin
45380fb9c3273dbff9b58c05d3c376748b6e74be4581952706bc920728196f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16223 16628 bytes

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