Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b028510b9d1c6ae…

MALICIOUS

PDF

87.1 KB Created: 2021-08-13 10:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 808f4a0aff345cfb613f374f355113ca SHA-1: c97061eba4052f88df2c49ec95117e679ffc6364 SHA-256: 3b028510b9d1c6aec7fb9b13e6bd03c8b321192a90bf394ea2536751730fa2ea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tiklatakip.com/calisma2/files/uploads/54281920649.pdf In PDF document text
    • http://zwickerfoto.hu/_user/file/29822872065.pdfIn PDF document text
    • http://usmleworkout.com/files/file/1047703577.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/lunuzilobuzag.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/wajojenaxigupuzawomu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a231477436d---65163307335.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/gebazunukodeb.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608df699749b8---25473953602.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/g8qvcvalb1sih05suvt33vanda/96966303751.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/xubat.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608353893a68c---27130809167.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607893f799f49---dazijaxi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ce394c43---fupebiwegifirodizuti.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/32399194886.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7bda6291891ad96738ffcc320b1f76fd/97917910283.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae311a742---53619463072.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a022bf7f236---mujopumekepu.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/74828521206.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/92837525731.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/kigalujitejedifegajisun.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/70946798366.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/vebibaziluxenaxunanija.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8094855dce---16883510831.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/rizane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+theme+for+toastmasters+meetingPDF link annotation
    • 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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 10668 bytes
SHA-256: a899d6e318afef7e29daee775093589cf4994aa57776c78725a9b696e529fbdd
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 17272 bytes
SHA-256: b332160fcca12ca483f0cf840b675ff5fb497a323e4e29c2a74b175196491431
font_02_sfnt_off000134e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1