Malicious PDF — malware analysis report

Static analysis result for SHA-256 412935cce52a0769…

MALICIOUS

PDF

89.3 KB Created: 2021-06-28 07:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 53410d9bb9c7ff41f283253e453aa920 SHA-1: 14bcdca70828b79336fb3a9766bd5c12a8d3bd36 SHA-256: 412935cce52a076998d2e2e6b41a5ea21f93b738e02ca389fb5bb20f667e2d61
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for SEO manipulation or to distribute malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://okwmd.com/upload/fckeditor/file/donubeputugokeperazisak.pdf In PDF document text
    • https://sluganarodu.org/userfiles/files/80785496037.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/foduni.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/wezadukixavemixelokajul.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/pesowaxatasamudabatul.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/vikomjck8n2dctgs5i7rq87o86/gakijedeg.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ptdo354hhk3j6a4u8jhqmh8oag/87324961120.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/96843037274.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097042062247---vanapuporazuzaluzetadalug.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/tisowegoki.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f0ec58acf---11226077355.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/joranopogav.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c736951e1---vetepewuvisilowen.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/28120310419.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076929be155c---897607427.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc93be5ece---dixepazevumufofodufofesi.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d1a33fcb3e3d27a32901713918f533db/jisimodetuxipigisu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f9a1b923ac84e19bc70735cfc3f44cd8/duzapox.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/15095453651.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/sofosavusex.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/83849738835.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a05b6305d---rixur.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1b29c0ae3596fa2fde6219951b531dea/28109635268.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/eb6216ace521d30a8ccb2c5533d9ef53/pefadir.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a2473db5995754fe7d725fca8be4caa5/dixarebikuzexipivobixeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=country+music+hankPDF link annotation
    • 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_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 17992 bytes
SHA-256: 037ee2d4dad4b2b1c26a897077dc2066db9710c52105d0e673eaa19cc12444ad
font_02_sfnt_off00013ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF9 10656 bytes
SHA-256: b010d112794ef428bae7f72488b00c13ddf55c306620aa2f252ca7a8ad2c64c7