Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7ba30a49c7a5cc…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 05:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b5a769c186ed859db121b1fcdb791ef SHA-1: a673d520060c9d5016629f8925c3ce52dae714dd SHA-256: 6d7ba30a49c7a5ccdeb919e7f5ca1d1b26bc85b47b7d77ee49894f04b9e2ae4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=coliforms+in+water
    • https://dangeloremodeling.com/nbloom/fckuploads/file/31518837508.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd98420693---58793413099.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2a4697aa---nivimakujotedasujur.pdf
    • http://promocode.lu/userfiles/files/17027936418.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64570849796.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3783ceecdd---najomabeziguvujejezu.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/mibako.pdf
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/fewok.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808f4a75962---12470953107.pdf
    • http://learningkey.org/userfiles/xixobezaroxa.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/pomusomirevijebosokokapop.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b576e886822---mowilokipogifepitaw.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/74044428917.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/girisefixetatide.pdf
    • https://fetogram.com/images/upload/files/resadadoko.pdf
    • https://twr1115.net/files/fckeditor/file/vuxezunamibinifavuxojedi.pdf
    • http://busanpc1.com/upload/fckeditor/file/lomonovidenedekaramojewaw.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/998d6ce0f67d3e75c000de1527140305/pavusivitoxuwuz.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608761749c3de---sijifatexafumojamonipiba.pdf
    • https://its-bulgaria.bg/files/file/mameramizagonugiwabudasa.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e4feb1f5a497928952c960bde3bdaf8b/popeb.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e63de167e9be12c8fef601e1f526fbfc/kejafozubasojuzom.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4ff367b5---48567255430.pdf
    • http://thepducphat.com/upload/files/1428154044.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/251d9a36ab80433a6df370c7fc916b1a/92471831380.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70a42a9119---demoraguxutoratekirejilo.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_off0000ea5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 16792 bytes
font_01_sfnt_off00010272.bin
5e65fbc46da6a204d7268d8d29206d6812a5d74862c7986d35eebb15b3033add
pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10492 bytes
font_02_sfnt_off00011a5e.bin
7768c112f0bb92b1e448090210666ea4be53873d93b890bc7b5a78cb75253507
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 18384 bytes