Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41db4e3734ddcd2…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 13:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 818e4a6c876cc4990417bb6909c60308 SHA-1: 0c2c44ae921381724e4c65b8ee78bbedb2971cd9 SHA-256: b41db4e3734ddcd2ef817ba3af7c3eff91f259b27fd38f4a816394c04d4d916b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=appsc+question+papers+2019+pdf PDF link annotation
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/feace62f5b7c8a2e1b3b9c367a01481e/83326411128.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161139436b0021---21204610774.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/dugal.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608008b566d26---vuretimudigawene.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pamikqkj2sal55snon9dvc9qc8/93699241454.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/48367242801.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/5bf971ecafc473b62e27eeea3b62521c/bowuzezabobojagu.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/fokogegapikoxuwo.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/86501465181.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/91108284638.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/dipasotafudunijisowife.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/98838994829.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/zamekilizafumagefegezabeg.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/26790370234.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c93307d9296---kuribenalowakiseleri.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8619bbc033---64895392999.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/36053518411.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b3d75374b000626cba5032e4c3365866.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/59115286696.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/sisexinibuvumebanajejut.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nfodaei457ghr3f6fqieoqfpic/23257447365.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/998583f50ac01a2ae8c92ee293c2a9a2/66452283226.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
font_00_sfnt_off0000bac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC7 16328 bytes
SHA-256: 3308e30f27082ea2ea55b146c39557b6b4ae84673074f646a8882f598d95ee2f
font_01_sfnt_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 11256 bytes
SHA-256: 145cc406fc3a1deb561cfc9f860fe14c67f209041e14849924523a9e4a7525f8
font_02_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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