Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fa36d1d99b25f0…

MALICIOUS

PDF

92.0 KB Created: 2021-06-30 18:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 505ea7d5e3fdf3f0e0d125ec958887ed SHA-1: 842d4e202be4063a16dd68ff86f028931587cf4a SHA-256: a5fa36d1d99b25f0e19796d7578fcc70e3929722cea394fa68a85a2f396dc617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malicious content lure, as indicated by multiple heuristics flagging it as a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://catamma.ru/uplcv?utm_term=small+tick+on+dog
    • http://ylgems.com/file_media/file_image/file/78580520111.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bde0338427d---4386706021.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf904058e---83310954230.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b078c6b538e---zasovazuv.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/bd5aa2e66a3b4095b56b76c8a7812093/90221117814.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/xodiwuninofuxanojodozu.pdf
    • http://asiadomainstore.com/userfiles/file/83182552248.pdf
    • http://seoulsquare.com/userfiles/file/ranuvuxelalufulexujex.pdf
    • http://www.bandungmesin.com/file/dufofuwalebibozisopen.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/575b44894b145ec0aa9737de6121879f/didigilizamibelefix.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/67d093dd0bf6786931ff1bfda812c032/ridujawuzibi.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb7b6baea0---lugitalisawijijovojuliwav.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bdba87ad7---11769655862.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa908a77e---zosopukoxilagimelozu.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vhf09gqj377oi3o73i4vnkr62e/45014350189.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/10c6a450ead4b6ec4571b209daf9ac4f/2366028126.pdf
    • http://kubabus.cz/novy-web/upload/file/mobokutovawuda.pdf
    • http://greatnice.club/updatefiles/file/zukef.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c330957ddb3---rinevasinazosowikur.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afe804c6059---piguzefenerolugenizolo.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/bff8d2d61fead60decbc9441297d8303/meviriganiwokanovuzasegoj.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cbd4d6cbc---1523081652.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948127d6f09.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_off0000e99c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 16792 bytes
font_01_sfnt_off000101ad.bin
f8a592a9e1dbf7da9a5dcfbfdeb48eaaeea15069fe9b7fe87f73a76298a44778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 17780 bytes
font_02_sfnt_off00011d2c.bin
4b02924f06499e8ea1b96d7e3f3318d84d5f3fc34cfb9ff805ad2a5e00f0211c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 17080 bytes
font_03_sfnt_off000149b2.bin
ed7ce92eea9eebd92cd958cd09c021ee4968abf62d6d769d61ac63b00dc28aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149B2 10480 bytes

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