Malicious PDF — malware analysis report

Static analysis result for SHA-256 611a87f6809204a1…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 14:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81813da81033c8ab3a61acacc8f2d499 SHA-1: 2d7b7a7062a78cf5428ca9c388caaf961866bb73 SHA-256: 611a87f6809204a1c22b5e71652bc7f2a34d2a42a52967fdc4f78bc261d1d337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to exploit users by directing them to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://huntic.ru/uplcv?utm_term=why+are+you+interested+in+sales+answer+for+freshers
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9132ca44464f3c9b163e059353910826/16831826189.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5187a7b186---gowubajanep.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6900f120bc---zowetukosavi.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084135368471---93642308549.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a83e82ef13d---bobukegididopoje.pdf
    • http://cjandjunemillerfarm.com/clients/75830/File/wotomapawa.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a45fd13cc---gemopebesigokurajizetox.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9u62e6c21md2qpuihgbfujh210/38252588638.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3232d08c---dufodurudejobafosokegi.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2d9aedeb---14809497495.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099efe0c7c84---terizotavoxafefuka.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160782071738f2---janunotujofinunoratufife.pdf
    • http://tinnaduraflex.com/uploads/files/83972101835.pdf
    • http://lafenicealcamo.it/userfiles/files/84494347153.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/8u7g3ro39s0tc39rbjt1i0fi05/gafivutenug.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c25bee2aa19---78469670939.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/thf8lovbhk0pacnp8a10vpo66q/sufinusapululerubiwiwex.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b010c7308f---givewefifewukoleti.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a848916681a---dadumagilamogilawupop.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a587ff94a5c25a7facc7466db7c31e1a/46050671629.pdf
    • http://hoteldanang.vn/uploads/images/files/tezenuwewufakopulasona.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798de92495a---mumezadubovunedobulini.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6ad2963e8a84a6b3b4e4db0f0aad1101/rikikutanedidaz.pdf
    • https://m-astar.com/UserFiles/files/66554514796.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/815bb64ed75fa4e13ebc51c71bc16aef/15463330562.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_off0000ef3c.bin
7850ec8ad5390d2fd913f7fa2e2823d768caca7aabd1510da73aa94cb754e07d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 10744 bytes
font_01_sfnt_off000107f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 16792 bytes
font_02_sfnt_off00012006.bin
d5bd87cacdc79f0b951c42631f3f3bf8caa944e3ae98a274a5346ff5802ce228
pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 16844 bytes