Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1e5189ecdd7cd0…

MALICIOUS

PDF

90.7 KB Created: 2021-08-29 10:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7016b4800c14b4b6ea6461753bd0e3d5 SHA-1: 889a6ec19c3d943ea6fa7bf91578e0bb1dd85e4d SHA-256: 9b1e5189ecdd7cd0f06f1758adff6fa0092e5cd290fb68e661c8e2b50f994916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc25ba2d053---21657854849.pdf In PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/wekuzudilo.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/59958353629.pdfIn PDF document text
    • http://sam-global.info/files/file/45529527437.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/44447695839.pdfIn PDF document text
    • https://datajournonepal.org/files/70989690800.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/914khbjh8opfou1jngg442ffc7/77011305409.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3cf65df5---795368783.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/witozurowogufe.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/82858648857.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef89b9ed14---83894415298.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/31842084693.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/27000161438.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/47228233688.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/garonikumomaxibej.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/48037585555.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sorapojewobubisureliladez.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876f1770e68---daxixisisaretipasijujewiv.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095095ae18c7---toruxetabujidi.pdfIn PDF document text
    • https://zzhqhi.com/d/files/durasivebinalis.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/nifinusifanezowivetokeka.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f1669a296e397da95b598971a0647551/98606510204.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16091e647931a7---21047647439.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/13007285896.pdfIn PDF document text
    • http://bronia.org/userfiles/file/4179118281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=name+the+film+quiz+and+answersPDF 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_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10868 bytes
SHA-256: 26554465b06e21deb9c389ecbcf6efb5c6528e8646c6d8052e60cf6b455144fe
font_01_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 18776 bytes
SHA-256: 804925725e3d641727b6eef77938b3487c12bf2445f6f9f347f32a272abac16b