Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1925e6426f16e9…

MALICIOUS

PDF

87.5 KB Created: 2021-08-10 21:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40fd0f15dc54206399f65d22367fc700 SHA-1: a85b29f3d9a588b4ba6894e0ccc426683c743c02 SHA-256: 8d1925e6426f16e9442366417884588f2c366f1c1af60a1d94c9564c95d9470e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that leverages a link farm hosted on compromised WordPress sites to distribute malicious content, masquerading as a free book download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point to a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4d205e7d67483e6920ab730f3d25f580/25335990509.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9e8bb31340cd63a40ef4e3096aface5b/16815215216.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/situsibamijilijuvejokok.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c9401174d---nurega.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/posezorire.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f66bc2fd2---42862149790.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/20054615896.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/53008606994.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfef5c050e---6693547362.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/rebanirimun.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/495486324bd4b3ce1f37fd3740dc05a8/87351558658.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/ledipakado.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5588f0f1b---95923598597.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/41787851003.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f37f6d0f5---nemotup.pdfIn PDF document text
    • http://novichiha.ru/pic/file/kanizafalokijawen.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/volukokagolejup.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/zabugokofid.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb05c70252---69218490613.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zevuvivinanav.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082feedeef3c---mazixikidafi.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/kudidibixobamejenotikite.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/51005777481.pdfIn PDF document text
    • http://naucseto.cz/storage/didejawafomuvojapokobeg.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/301cd27edc544b9f08ae7169c37c5de2/lidejiwulosewifarifode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=quantitative+methods+in+management+book+free+downloadPDF 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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 11344 bytes
SHA-256: f5fe4303468533e30860741314a75edec6f88ed2367b693a93380da1476b0147
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 18004 bytes
SHA-256: 0f9ee00e585b4826609bfd4ec9cc0a3d1477765ed42dff7d16c910ee0f44f5cb

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