Malicious PDF — malware analysis report

Static analysis result for SHA-256 773cd3bfa40dcb9f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 01:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 583333da59aa93b0cc4d430d43d051fc SHA-1: 04507d22156688cfb357ba0fdda5c6b1854adaaa SHA-256: 773cd3bfa40dcb9fe26151abfad31ea9e6680f2d5d38432c41b7c43068dc55e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://cructi.ru/uplcv?utm_term=mechanism+of+action+of+aspirin+pdf PDF link annotation
    • https://alate.org/admin/fckeditor/editorfile/firutalafilarawidi.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/xivuroratisogibesapadaj.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/fatojebelenidofedoz.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e70d738a8---bunivetexo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/78n9ad6r54s289aabhai4bnt6e/nisix.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612d5c5345ffa---4709842450.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/73440931811.pdfIn PDF document text
    • http://texmet.pl/userimages/file/76448804637.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/judozewegixuzatevujemexof.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/96731534742.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/72fcf36fe3991a632a177aff90fa12e1/surubipafidibi.pdfIn PDF document text
    • http://atomleasing.ru/media/File/doxikababeru.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d61eff4a955a3cf8d40699c03d81bc6c/xamoze.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/reduseti.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/xawutugukisetijo.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/23932859576.pdfIn PDF document text
    • https://mfdesign.hu/files/file/56528247236.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/98402201663.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/88142978940.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wuvun.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/pujipegevogo.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hv4o8nsi3lgrm9uiqd1rt2r5n0/57071910398.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9c948af2b---8922007573.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a804c450da4---peduruwutakilapemugefa.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86101ca8a---51600149816.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/30776562287.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_off0000ba19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA19 10832 bytes
SHA-256: 9dbbd39afb1bcf67a6faed83092a67d1be7386a5dcc3b75ef029bc4b09cc3d41
font_01_sfnt_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 15448 bytes
SHA-256: 1418135b0ad77ecc885f614d55a985fbc3895cf1ca6bee62410bde4d0b79cbac
font_02_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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