Malicious PDF — malware analysis report

Static analysis result for SHA-256 57156264b1c330cf…

MALICIOUS

PDF

83.8 KB Created: 2021-08-19 23:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 318da64cdd9256c5189a71d5fc1009f6 SHA-1: ff0ea4757bbe5b0ff11c2482780a72a1f9cfd84f SHA-256: 57156264b1c330cf5ae9951f045b88cf6380cef42d87746255dd2d45224ec146
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 numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://medvor.ru/uplcv?utm_term=ygs+b%C3%B6lme+b%C3%B6l%C3%BCnebilme+%C3%A7%C4%B1km%C4%B1%C5%9F+sorular PDF link annotation
    • http://servis-hradec.cz/files/file/70478532544.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/bareg.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/18086915201.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vanenevotonufiru.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/84662735964.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f200ab64ac---nurakivujaxawojox.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/pinujeruzete.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/dutilepawenewuxaluxuxug.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/64545469310.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafa9717087---lebipubazi.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/wipova.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1147a24b---17892817164.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ofuh56gpvbg0b65nds180d173b/sumexo.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/40336009285.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/30bf5a00d62c615e7b54e6add067fe30/tujugifutesatan.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f017849237---313987687.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4fogrhc8n3vjd5svcblmpbnqp5/kagigumated.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098719e90a3e---dubamawubusimataliviv.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4da2e099916a85d43cf304750d253912/xonafodunuwumebu.pdfIn PDF document text
    • http://coronado1977.com/clients/54390/File/lonadatiwawizora.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076431c865c0---3876754726.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/84486473540.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F1 16760 bytes
SHA-256: ac2156f27bad8b42c4ccccf2a28a86f4e5c7677926a18b3a4317640fdbd4df16
font_01_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 11560 bytes
SHA-256: 4dfc54b03ebe896d2bfa98452d8082c97f3c677fc75ad80264846bae9355486c
font_02_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 18440 bytes
SHA-256: 9b8614d039eaeca0400cd224b911d59b55bed7126d309e7162551e1d65e6f4c7
font_03_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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