Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a3f718614c6c59…

MALICIOUS

PDF

92.5 KB Created: 2021-09-01 15:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec908460f74accc52e93f76ddf0e940a SHA-1: ca5db5d33aaf39dfc4d978d24a12574dc6eb50aa SHA-256: 96a3f718614c6c595a1ade5a1683c92ef02a90b16d9bd7f748121673309f6a75
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute code, likely to redirect the user or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=apex+legends+system+requirements+test PDF link annotation
    • https://nepalimodelagency.com/userfiles/file/60468125005.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/88960859894.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-11/20210611041003646608.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac5ea00d71---42114100840.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610956b1e4872---vosewelijemojiziv.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accefeb2510---pizifa.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c06cb21e---90356348837.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/90094808276.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6a8cda6d0edf44fac2721d7c48561160/dewuduwapovelulonemones.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3bcd02fbd---21719517308.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/sosevegimipajizakideduv.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/5959349042.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856c1287047---gutolizujebupavuvimepuv.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35cf35d08---mejasejuluw.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/53628816282.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/fekurudiwirojedu.pdfIn PDF document text
    • https://ms01bet.net/contents//files/90453059691.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c08905bc0---51380804726.pdfIn PDF document text
    • http://sushi-belovo.ru/files/vazenibanilelexonigenune.pdfIn PDF document text
    • http://chpcentre.com/files/file/lokokusataboziba.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/sotetoxadimemoxazedok.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe4be4d04---gurinis.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/favufodogubexewekilu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4f85c9f875f63158a4de431c83d669d2/86988608566.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_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 10896 bytes
SHA-256: a20d46c9a39d6a1a853952a3135c433d91ee27a8415642cabf64d74f5e8bb259
font_01_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 17564 bytes
SHA-256: 3535ada280adbb7d256a17a56151d51f9b2b9435155d9fb0552300be69d23701
font_02_sfnt_off00014b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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