Malicious PDF — malware analysis report

Static analysis result for SHA-256 878ce7023765afd6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 20:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84fe05f0cc996c767d2b7f4dc5c254c5 SHA-1: 98e0d413f9588df87a68f5cfa1e5597c780be5fe SHA-256: 878ce7023765afd6fd434e62c5fe7c5a1e3121a5b008cab62fb066ba670de627
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61a83fd9d---sukuraji.pdf In PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/36515443592.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/4757587234.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/gonuge.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/guzes.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/75327036788.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/80888975081.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/87161683623.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/zevok.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/getatef.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/21242385098.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/24698920792.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/saxapija.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/vehmv0uu8eqki5lhgajvlg1qbc/zaxojarivivi.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/96588325387.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/wadekaragelatebezibajam.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/22783653761.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/folaxotefigegagefurojixiw.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/96938258897.pdfIn PDF document text
    • http://hainfelderteich.at/ragexokodegifiri.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/59874175017.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/pukozojonijiwefojowexez.pdfIn PDF document text
    • https://alkoplast.rs/files/xanebipidapegaxazewivexe.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131727cb31ee---laleta.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ca6e1671d6e4574131f33d492b1f61b2/40006187903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=context+in+android+applicationPDF 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_off0000b3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E3 10472 bytes
SHA-256: 29cbef993a0aaf28d792e1ca248b6313aae8537e0b9f356c4f6bcbd268a31c31
font_01_sfnt_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 17564 bytes
SHA-256: eb05f56cd7a7e56f08b65c8b628a39f25d450cc82966a4a2b125e8a765bd3293
font_02_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.