Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72e6f2adc2a1a69…

MALICIOUS

PDF

89.4 KB Created: 2021-08-14 20:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53cb7e3859a9734ffe4e76bd18e0f5e7 SHA-1: d3652db21f23abc5fef2204a07b4c5c8c3d9689a SHA-256: f72e6f2adc2a1a69692566ca14059a4e94ae3844c5c39523f3fec91d7383566e
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is malicious, including ML classification and ClamAV detection. It features a "download button" lure and numerous links to external websites, some of which appear to be hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest an attempt to trick the user into downloading a secondary payload, likely for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=how+to+reset+sagemcom+fast+5260+router PDF link annotation
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/829743b96980c60883955b0eb948496d/9098927800.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/37441750841.pdfIn PDF document text
    • http://autovoda.ru/upload/files/22891904390.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5f35fe1a14d9b8d431df730703280cc2/57553430904.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/11765358247.pdfIn PDF document text
    • http://ceroki.com/image/files/36413219605.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b1ebfc90c1266bc271caac1e94d0ebd7/38769207459.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608082df5ea51---kezifipimewataw.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/da96a488f2e538708835750207e03773/55982591831.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/35e202d0ec4d473b5b2038c85f6ffd19/57091905089.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/vobuluzepazudolujatufako.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/59185519548.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761f407d539---57153285926.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb45143995---gizagapow.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/rekubaxozupototo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 17448 bytes
SHA-256: c208b50ff2f02b37caeedcd81f85a85b7b17852514f7e392e6c937b27218fdb6
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001120b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120B 11156 bytes
SHA-256: 05c709a0ff18aa32a2f4c9ba36e677dfddf3289de5ccb028c6c6824fe460fdd8
font_03_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 16740 bytes
SHA-256: ea10101b213f8a8f372f6a1332f4a8d9cc6ad311f8a2cd58c54ae5b7440933e4