Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f376728e36ba919…

MALICIOUS

PDF

98.9 KB Created: 2021-07-22 05:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aeb75612bdec6e0073af20ef1440804c SHA-1: f75ff132cba3ec60f044e94db034be4fc753acdd SHA-256: 2f376728e36ba919e46f939b1e1a1f8dd08417cf6a96e84bd50fc7babf33ddb1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/885185ad539c894f6b0202c1b7a8a79a/nojolakowibojakuto.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5790c250b5---jikalo.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/tovenarerumonap.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/bte43tdq10ut4f0o8q85d4ocu5/33927535317.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/48406602126.pdfIn PDF document text
    • https://castel.ro/userfiles/file/83791059744.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/61v60ljfmoi2hnpf9uefnm46g0/74159563697.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080679092b71---kitipuse.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160927c7bb029d---1722685670.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2e6f2b01---11592796749.pdfIn PDF document text
    • http://superpart.com/files/31780083377.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sirop.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216182327591223.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u76ctqto4m0d4gpdpm2tbf0bl0/gitewupanubamizatim.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3633cf476---4952766320.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/kosamunisanosetegozi.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f9a45e88a---76202432071.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/resamerozol.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa13dbcebc---12212068016.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/5547848248.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/zevokeramegerel.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/23490734563.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ce235376---ruwotuwalelosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=watch+happy+death+day+2PDF 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_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 10208 bytes
SHA-256: 6d719ab361cfb4ed0c1a2d780fab6ecd8eefcfd83b33de0a3e13b7f551eaaf64
font_01_sfnt_off000135df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 18000 bytes
SHA-256: 55ce235df654bc3f2c33558212ea240a781b97e95880f95dc910572017397120
font_02_sfnt_off0001648f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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