Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c897418cbfc7fbb…

MALICIOUS

PDF

95.0 KB Created: 2021-09-02 16:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1fc94e99cdf297c623ea4f8849164484 SHA-1: 08e9604f9804a7bb4e0441711de271a18806c906 SHA-256: 4c897418cbfc7fbbc75bfca77f01f1f35f6626f1f9a127350807b5fef97ba940
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, which is a common tactic for phishing or distributing further malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests it may also be used to trick users into providing passwords for encrypted archives, further obscuring malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=vocabulary+workshop+level+c+full+book+pdf PDF link annotation
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f41651dc8fe9cc2e6a461e1798af66b5/67461444583.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/9719847893.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083817783210---riganedafajifovapudined.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/jiferikewanoxixipij.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202152496332690.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f72c2f7e4---40397225402.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/04c3e160d1f6d36d6d59d964abec3707/jeluvuditupunu.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/funiwogonilexoleluxi.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/38156505624.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6b898cf8295e33fd56ec1580f4175c50/detaxapevulibefixano.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7107204000---87964237191.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021053100302795.pdfIn PDF document text
    • http://skomi.ru/img/files/file/12329742505.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/97195572250.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790fe9e307a---37177910452.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/ripirexofujav.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/dd18cccc65c19f77f1b5dd9f08dd6b82/17845978402.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/3927794535.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a47551c030d4f176fca14357e26bfc52/81933633983.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e74c0aa3ec04d3458ee3442e694966cc/38209497202.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ed970110515900ddac423a6ec5a27f0c/dololadugido.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/pofanarezilow.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59761547151.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_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 18992 bytes
SHA-256: a7cbec6a55e2fab637609e3fca74c723206167a53c4c76932d25378c4fdc594a
font_01_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001532a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532A 10992 bytes
SHA-256: bfa48b42ce71099d53cca4a606de6dfa35c73d94f8d8c01e5dec71ed0eeaa5ae

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