Malicious PDF — malware analysis report

Static analysis result for SHA-256 591238fa9889a550…

MALICIOUS

PDF

81.3 KB Created: 2021-08-23 13:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ece8103ffca239d7ecd8b78565d33c55 SHA-1: 68bfa543acf72de39000e98288c77eac909fba69 SHA-256: 591238fa9889a5505337d772f3b842989f5c335b44fd2505f9c220e91bdfa7f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=how+to+operate+fire+extinguisher+pdf PDF link annotation
    • http://kabaretyimpresariat.pl/Upload/file/8026549786.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094f5884a8ff---85679698690.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/zunofoxobuxovuxul.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b151fed9b1---xigopomigaletemaguxawubax.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kojitulefososaxasanevok.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad11b52ad30---88180640160.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/b6irkav9t6kqdr6f9mji25a6mp/1770863228.pdfIn PDF document text
    • http://capital96.com/userfiles/file/guziduzawuripuf.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ce41bd68d726ff0971d208cbd32c65f/tinadakalumanomiluvatasil.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/15256713214.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/22568341656.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/difalitamesasojiniz.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xopir.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c7f1c3a8ba4eb8844a235a53a2707c67/79787303155.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/pakoxadoxazafakaberikubus.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/katurozidisupulovux.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1837d59552---37709462781.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/laperikilawiseguxe.pdfIn PDF document text
    • http://mutitar.com/user_img/files/vejuwolerumaveperiwo.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/gedewigaxakuwuwiwusil.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7815089fe6---4374666470.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/65759260946.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_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 11008 bytes
SHA-256: b989d3608955a76bbae298feac3da4dcdf755006c1c00620201e8fecf7353003
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 16820 bytes
SHA-256: da1da499830227b431d48a2cfd1d3c4fa06189e1eb044339053c1ebf209c6f76
font_02_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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