Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7099c444524bb2…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 21:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d8f9287acf382568df93e241577f4b9 SHA-1: 15a3e3ef707e552a616deaa2accb954d1458bc1f SHA-256: 4f7099c444524bb2e143f2603f0f55d2fc2305152e637b25986303311ed3f935
164 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links, likely to download a secondary payload or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cardion.dk/gfx/fckimages/file/wadofifafuvixejagu.pdf In PDF document text
    • http://sarkar.ie/userfiles/file/10114641602.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/78532009214.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d56da8dd---61645754740.pdfIn PDF document text
    • http://protezas.lt/i/File/34965176490.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/79957828747.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/13362208513.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/17715594549.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/jiwoguxirosadi.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/11618059229.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/4007276675.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132d757215b9---10439543137.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0a9fc8e08---10199047397.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/65657293527.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/86321073753.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/46517294049.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/86014832264.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/60732221472.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/54668266072.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/75002787334.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/545c6e642b83deb8a75b41c1c1ebc7d3/wejevojizavalalinadibodow.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/46419254410.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/24065404037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=utorrent+for+pc+apkPDF 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_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 10264 bytes
SHA-256: cd44e61282314b72704b2da88601cfb55cf6ffc830433c5ab932b90e80bd8fc6
font_02_sfnt_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 18428 bytes
SHA-256: c358d015d1a1864413472ffed6237c5980a7c265e5a81bf7157f71abd1068c32

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