Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c50c029457c0819…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 10:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b3a1d142db235e0b7e1885c587e6213 SHA-1: cbef64c3ae130cfc4edd28f8741c366df2ffcbf1 SHA-256: 6c50c029457c0819272de436c4ff41945b676faa29ec76bc13bcdc4d40fe407d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised WordPress installations or disposable domains. This pattern is commonly used for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://inwebjor.ru/uplcv?utm_term=i+want+to+play+d%26d+online PDF link annotation
    • http://metrominicabs.com/survey/userfiles/files/muwatarodubanuwowazeteg.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161465e6d6fcaf---43713020614.pdfIn PDF document text
    • https://atiksigorta.com/files/47999597071.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f1b096147---kilid.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/29544813119.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/95684619053.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/52e2f7a92497cc0561b2b0aa73fa3ebc/96668446858.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/10811090864.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/vimubelerixojurata.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/91450812767.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/21712797693.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/vifozovates.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210904004701_1057975035.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/18178487807.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/49628580535.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/vipexuzikovotep.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/xatafimofekora.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/29205447043.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/jobedikunokumek.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/zuxuferavogokarazesunu.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/nefixebo.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/78589229887.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/37713901844.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109040949169622.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/49221773516.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/xulizeparef.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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 10044 bytes
SHA-256: 574031330ceea3a91d55079cd62a67445f9192b22b0a9e10448ff3ffa8956e45
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 17316 bytes
SHA-256: 34c7883c46e78d8f1761ffd69102add85051cd05e4faaf11f662fa230aead521
font_02_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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