Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8d81a6e00fa825…

MALICIOUS

PDF

89.2 KB Created: 2021-09-01 13:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4277ecbf2b9c270b29878cd0496e87f SHA-1: 88826ab04d5f33f7c8bfea4a884a12f11c06d4d3 SHA-256: bd8d81a6e00fa825056ac8888d48869ff53d8e22b6d47bc22167edfe2263b8d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is designed to present a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://adamlegal.com/userfiles/file/69606688867.pdf In PDF document text
    • http://gocep.org/data/userfiles/files/37299334384.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/84112306836.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/600774be19c6e82bc0d903128adfed62/pibujugemadoxo.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210811044739.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/daluxufogizuvebugas.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/sazosif.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072d67c570f8---80241299843.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac35af475c2---dilapejejisesodevugutajid.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f10245157---sixetidodawuxepazagumel.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2298ead5beea55416eabf55dbd852cd1/jujiworivusudupibuzujovu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ea994a27cab60592610d16c755b8a79d/83463872831.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/kukemub.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021080820581073499.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c4dbe388b---70041886692.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/38f071bee2b65ef3b9a1c54e2ba350d4/43832083671.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/dewelebenexovegol.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/9571112861.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9cb40f95---kogufumobanisadafije.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/rugalaxap.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc96d3539---tuviwosi.pdfIn PDF document text
    • https://citytrafik.nu/images/file/raxegasogi.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/5933088136.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/miwetapopobafesir.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/m0ev9vebm9f4mt21462tvo0097/55422784531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=standard+of+perfection+rabbits+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 19004 bytes
SHA-256: 7962ccf9d382665829f55b17c2ea0a322b6ccc7a0146a1057c2cf59e9ac81374
font_01_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B57 10784 bytes
SHA-256: 9dec23ef5ff3545c6d80f245726ff131e6469449000dc697a6fbe83dffc3a92a

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