Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8653b1e474ee90…

MALICIOUS

PDF

95.5 KB Created: 2021-09-02 14:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b55b0fc3dd306cba2ef4514ac6263b22 SHA-1: 316de96493497aa5865b8d57df23e72330a7377b SHA-256: bd8653b1e474ee9063e7dc58e6b53f29bef57869dceb381af2f1e3efaf906533
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a likely intent to exploit users through deceptive links, potentially leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://186086.com/upload/files/kafiziwulawuvab.pdf In PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907ff79dd94---tapelafezugewulare.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf47234d986---80634810954.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a8a2db75203ab78efcdf3a10e095e5d8/42554655820.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5ebd96685bd6e22e382f553c43d2e0c8/90028062270.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/24348306591.pdfIn PDF document text
    • http://art-ball.net/files/file/zukogevige.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/gawonoxojive.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/11191904187.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/48010485272.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ae4656f78a050e6fe8ed017472e0fea5/jowegibasivisevuk.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/fagonob.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce91bed1d---nekililu.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kedofivizagux.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160fb7dcdc64be---xoremepijo.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ce7f1f57c64c887dc9883ee7248af857/vewunojoduro.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/64354333216.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbfce1191---dimoj.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160acc9b856823---luwinetu.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/bdcf6cacfc407d462c0257416f4dd06e/vemajepidibawonavad.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/futopokaxubudiza.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/xinazawukime.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/32073952258.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/32713291134.pdfIn PDF document text
    • https://banghenails.com/upload/file/nibirifipetodolevo.pdfIn PDF document text
    • http://liyangah.com/Upload/file/31251125141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=game+programming+patterns+robert+nystrom+pdf+downloadPDF 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_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 11220 bytes
SHA-256: 6619c2bbe793df8d762ca2b0a8977e41c98bb4319dbcc6c49f37f515607d6d0e
font_02_sfnt_off00013ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED7 18644 bytes
SHA-256: 12b65a830d3e23c32a794cda5e98918ddb9b2d18c339fa0657071d340d9629b5

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