Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a4007d41440039…

MALICIOUS

PDF

93.4 KB Created: 2021-08-05 04:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32fe9e5e25cadb7e553944d319fc184a SHA-1: 769811fb534debdbf5de5f3a77ed8c4827f2735a SHA-256: 58a4007d414400398153c14136d135b6de8e21050602a49ff270f83234ba620b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=nescafe+coffee+strength+guide PDF link annotation
    • https://vydavatelstvoklett.sk/userfiles/file/rusebizurerivujosinivop.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a440f925a76---73526687859.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/87441295515.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ffeacf37235---tedinofobaravuzi.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/36918161440.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcda9aa5f---43899199765.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052722565773499.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/51506415304.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/daf8717cde58c726bf15ca29a8c7d666/39389031790.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae0c63542d---1369405430.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/197962292e53511120b0970c04dc6837/jidefibifo.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/tonakitunowenufokuzew.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e00d4d3a8043b7f6bebeb5fd540d53ca/sitoletemero.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/siluzupovunumaj.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/62951722731.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fae0fc01edf---nijepomaruvamibirizikezi.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/10590456521.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/348d685d5f1d4bc39347e5dd2a26d1ef/wefewojajo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6206779ee6---gepugiz.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xowirixekokepawudumotit.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c84587ac---31075243423.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/kajoberuvezirarux.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/22250186621.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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 16508 bytes
SHA-256: 769942884e4d381c394e19081ee48897751ba3127cc30a320accb1ac0b98b9ef
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 10784 bytes
SHA-256: d64128478c4f16fd05e2e04eef23ee13b55d8160a353f50e6a2a5883ccc36119
font_03_sfnt_off00013a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 17260 bytes
SHA-256: 6ed91290c541b05fde40cb5659098bb91fb1a51e49672743c2b26433c1e3c72a

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