Malicious PDF — malware analysis report

Static analysis result for SHA-256 9934242d3395790a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 06:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0c040d9480e8fbe236b2a1f7ca02092 SHA-1: e409d0560fbe4f535e2ac8ab4fcec0be8c025e84 SHA-256: 9934242d3395790a1d6a38479326b0c98fc927c7631ed3ce22a14456e4b6f031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for a phishing trojan. The document contains a link farm with numerous external URIs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://agataklimowska.pl/userfiles/file/22058167878.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb25881ae---52528191714.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/94455312772.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/devupanubunipe.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fogofaxiz.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/29513241145.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/10941996165.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-12/20210912024948101496.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/21961429739.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/zefijorase.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/99329558661.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03d448555---zefidok.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/75507453286.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/wamipolokuxadosalilowe.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/raganigovilomovim.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/wotifanamunukota.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161452d82d5241---74630879671.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9bslfahq61db8dcb580faih6hr/xafuxukidunoside.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/10445865514.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///42378253796.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913125133.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ginavezawonidonizaxilusiz.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/46095899773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=camerax+barcode+scannerPDF 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_off0000b613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB613 16228 bytes
SHA-256: da0c5520e6f87c92ed9a79ff751d4a02f6ff0ec71cc6f980d5b4ff7448b45b3c
font_01_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 10568 bytes
SHA-256: 897e3b65aa816566b0e901053180f783a086d35096b4e3c8217c06b17fb9826f
font_02_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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