Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c8c40b886a1aab…

MALICIOUS

PDF

94.3 KB Created: 2021-06-30 04:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fb79f0d6b02039d08a6e54cf09393ff9 SHA-1: ec0611665b28cd0b34a128e871bca001cd0548de SHA-256: e1c8c40b886a1aabf4e40834398fbd79d743fd7d771b53aef327085152c8c1cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or redirection mechanism. The PDF's structure and embedded links point towards an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=how+to+change+apk+name+and+icon PDF link annotation
    • http://sanarina.de/ckfinder/userfiles/files/xufaj.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/be114ff0a52e1a8dacfea9992589fb64/puvoxe.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/zofisinememixurilosar.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/14171051951.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/feginavakofa.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/bsl6bnmgldbmolhc15ra8k1l7e/80298836416.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/4708091546.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/161e865ab508dadd1e887bc56ddbe15a/52681024564.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ac51113f9c0---sumasiwezaxufo.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/bimugaruxoj.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/77182988136.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021061811025437988.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/86463812166.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/36342542195.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/kodigelafudite.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/2891019991.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160891747d622f---58297592634.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/oaj35000j8r5kkuuol7o7qiji3/93918639246.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mitevipuzilirij.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/716c39de04bbb74d44c1cb93ef35877a/73652811142.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/14938489547.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_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 10816 bytes
SHA-256: 5767ad8c3ca10900aeae8a72f889170c3d15d59f8b581bb1b9b60403c20e5a5b
font_01_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4A 17856 bytes
SHA-256: 5925d93b52fa776dddb5c9484702c1f3b4214e8a56d417210107669f0b4f62b2