Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1a7251f0fb73e0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 21:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46675832cce0280c58844db947c9fa2e SHA-1: 7a843cb4a4a3869f8f958d4bd4069f4857cc5005 SHA-256: 6f1a7251f0fb73e03b16953aa2b879193a0bf596ebcaa0c221b3b35dce3ca666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=mast+video+editor+mod+apk PDF link annotation
    • https://prawobrzeze.info/userfiles/file/bovokixunotazixog.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/69020330583.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca2315c871973ddf04bfbb39cb801ee1/29153442612.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/28988014555.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/81193815363.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/62506154425.pdfIn PDF document text
    • http://kme-kme.cz/files/file/niluvinumigajis.pdfIn PDF document text
    • https://harom.ro/files/file/81301294746.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161368cace4e3c---fuwopotarafojuwugufobam.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b25c6eb4c---47193209828.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/5410094459.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/vugovijuvamowatimeno.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/45393080416.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210905133847.pdfIn PDF document text
    • http://rrarental.org/upload/file/11107954381.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210906_138E4A2FD893A3E0.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/56363239395.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/bumimesavazezawiwa.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109150549564936.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/82539574176.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/23796523870.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/97759275333.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/44549282.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/tosorilawusajaraw.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
stream_004_off000123a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x123A4 10552 bytes
SHA-256: d2d336729033d39fa403f14036f1ea7c562e4c74c03ebe0b35c8b9a7d71f878b
font_00_sfnt_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 19640 bytes
SHA-256: 3697fd20592f986485612d7716ecb30d381baa66d99f4a917744827e7e6993e1
font_01_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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