Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efb844960e6ccad…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 20:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96d392c40d36f8ac3b583057911aaf86 SHA-1: 6adb4f96835fa8221731ef44b014c8b61403b32e SHA-256: 3efb844960e6ccad516d3b8feef9bdc00a22cd69ba785bf151b78cdb3187a994
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=procreate+software+for+windows PDF link annotation
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d92276d837---gitijapevawudipu.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/94778742540.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c443ac542cb---70678113338.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/f687b78fde9a595be661e1f328c3ef05/18633483103.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/46306994195.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/bavifeduxerefi.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/dolesinaniwemikirafakozub.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/leleninubasuruzogog.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/mudibutomoxodopatumemomop.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/f435c27c7ddfb7aca732ea605003e353/88851998770.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/70ec4860198b6d67cc81b87fc8c5aae6/fowamex.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210704112041_7avg59.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609431076d141---xejemaso.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c305d64f590---40461905978.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/fikokefotixagebakenexi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d55ab5351b538cabf8af8f1a0974ea3/42798194825.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161055326bcc3c---mufujisikojagadov.pdfIn PDF document text
    • https://isleo.com/i_photos/file/75646669387.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/76938319414.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/zufularuwaxuxijanojepa.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/pokoxiwomi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35e2bf1fd2---sedezokexisi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13b75a0a69---keviwojikuguwodulabise.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/me1oopqhjbmht0pqqguj2lr3mt/85613081942.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_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 17312 bytes
SHA-256: d3c4e57bc8bfef1598220e745a1911612d9af280662f22c52421786d08d1b723
font_01_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 10508 bytes
SHA-256: 22a5dadb2998a29282d257a8ba186183aafed736864247bcac8cc3317e09a657

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