Malicious PDF — malware analysis report

Static analysis result for SHA-256 26583199aa19c618…

MALICIOUS

PDF

89.2 KB Created: 2021-07-03 22:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ffef0362b3f05c968a7ec283db42c377 SHA-1: cb7b84ba5a72dc7aec771951e6757e783dbc31ea SHA-256: 26583199aa19c61804cefcc0dec75cf2e1316678013f462bb00e8b08d13797a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress installations and other potentially malicious sites. The presence of these links suggests an intent to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=drawing+dog+with+numbers PDF link annotation
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e78b4737c8f21ea2996fc7869b375cb4/zajabenebebemoren.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3cd0ac7c03149e4f9d2d457b4636a159/xubiguxo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3fccb2df2ba66ac206354c08568b3cbd/jilubedobijugasopopabogip.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/575b44894b145ec0aa9737de6121879f/didigilizamibelefix.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/rh124148u0s8f8flo3dvqp3u1l/9101476669.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/donumofovusivavu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/l61b0gl64de2rrgvl2pl8u18q0/47644876097.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/leg41gq399ric3jcbjirnbcene/zojedozitabominikube.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe05936c1---kaxefixorukilalodevokaf.pdfIn PDF document text
    • http://heureka-cz.eu/files/ditulariladunekekaxi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3b1e7fd8dc8c2367a29b5beb3b8e4294/peviwanobukox.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/109f8b1b575014f33227c1b5574ce10b/zisetasezi.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210703002903.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608331c3b8cdf---jedapazuxifatonilukukeje.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076309dbe779---22073130229.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c404800ef4b---pusovinibuw.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/03ad1d7a885cf02f3f3e392a15606b95/gufimugupixefinadome.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/e04f282f559c1f350eeaf666fd5f8dd1/19183810344.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/jusijekux.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/bafumepabov.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/vaxapa.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ivp7vfvade7gbffa5pfgees8bj/bikun.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088430e91ab3---72889943521.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/diputafasobibufugovonir.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/6556f72550499b4e6dc2f686c4d02163/jipigegagijavugodivenuzes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 10976 bytes
SHA-256: 17c54fc6b52bba835aa27138452b710f73ac6557cfd13a4af528100a04c6fa40
font_02_sfnt_off00012bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF9 16804 bytes
SHA-256: 10428333b20c5a2250c646ed4dec19d846b9adc3d248f0551dd9b38eedd461f2

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