Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe5c56e7ce626ea…

MALICIOUS

PDF

120.7 KB Created: 2021-09-02 20:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0be99f9e0235bfe2cc5e132d51401305 SHA-1: 587731dbbca99e3a3fb095d48ee6b8c294d48139 SHA-256: bfe5c56e7ce626ea5e7f1bd4ad127a25ca15043e731949daa77c64238559a7a3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://triangle-electronics.com/assets/userfiles/file/nugunadugewi.pdf In PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/24c7f0a11ac92bc8d5e4f6a5ad105025/88813397977.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ahmnflmugc652f63pkllaeolsv/91552537811.pdfIn PDF document text
    • http://mopron.ru/upload/files/mubozijabesevuwewipu.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mafimosafupebaze.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/cur4ldgt8cqdbakke4q2dd9qm6/paredi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071cec3433e8---viwizoluligijuzaxabitijo.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/wopobalep.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/33001943366.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/32107233735.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a1b4e66ff22393cd43fc8f73136f8bf8/94672746726.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/79586400702.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/sovotova.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/donogowokuvatixare.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/nolegufuzowepifiwaresuke.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/dobagujobererapuzunizi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/75ed157f078776b01072e7ecac6cbe6b/7703463395.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/pifilasevapelivetef.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/553148e626d3c78d99bab7f04269b7e1/pejunuwelomupiluzekelefe.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25fa20f20---13319434084.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/64048330936.pdfIn PDF document text
    • https://wita.lt/images/files/37372830957.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/kumewinudad.pdfIn PDF document text
    • http://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/1366523547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=naval+correspondence+manual+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001908e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1908E 16716 bytes
SHA-256: e08e91945b70fe7f45f07e805eba86c21d31fc9f309927c9dc33a931622272d6
font_00_sfnt_off00015fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000177e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E0 10732 bytes
SHA-256: c4919a47c4d5caee8db084b337a3a37fb13684fa2c49517d4ddd9cf84f73ce5e
font_03_sfnt_off0001a866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A866 16936 bytes
SHA-256: 8b738aa2f15b1e6b904f0971adc623911203b2120c92ece6552d2962e0fa7276

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