Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b7cfa50fb17adf…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 03:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb365f7c623f7a9c7d0b9e4e6c5155a5 SHA-1: b59697fa88768beecf0265626b48433a9b6dfb13 SHA-256: a3b7cfa50fb17adf844c58a1e3c5c97ae37cf70e2f45a83dc95bd8e338b4fa68
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drafthe.ru/uplcv?utm_term=department+of+social+services+near+me
    • http://ctkupavna.ru/upload/file/50634190079.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1315b3c8---kirifovafutofaxavov.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a046f06bcb---96140163480.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/49204505381.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f213577d---74842416913.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734cc9ec8f0---36457560119.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e70e9a18---67880156932.pdf
    • http://nuraski.pl/wsg/userfiles/fesub.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/xuxubu.pdf
    • http://ippinnudon.com/uploads/files/wowaregidokuganadijimazen.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70a7e6a27---33011463875.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35495156796.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6da2504ec5---10707458390.pdf
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/82010545700.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c9f3c2fa2aa3e2200c0bc5119275f888/28953929225.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9b657920b---91968463798.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/85d51dddb826d2cfb58f59098846844a/putasi.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62e5b749b---93932337135.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d30d1f490af---42677906730.pdf
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/kosuvekenawumoraliduk.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/mcl1mpiia8kh32lo3ni9vov0k8/94512278147.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f5c8adf96---52730280873.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe86b3744---11429146391.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_off0000ea6b.bin
c2df0c6d0b3332c415e5392b6b5f14b2d472f32e87d9d041937a7cb7ae10deef
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 17932 bytes
font_01_sfnt_off0001193c.bin
59abc5d13c6e172c8fe48dabc3421bbac620cdf6a5024c3d5c2a5126557a49f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 10708 bytes
font_02_sfnt_off000131dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131DC 16792 bytes