Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43c10c88ce11089…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 01:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31a5ea1a44a02928166873a9c0f7db26 SHA-1: 16df17bae0e9786ca65e74a4554d0d3ff407afba SHA-256: e43c10c88ce11089b2727891756ae58bf41ce81f4471be0706377f1bf05a3941
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f57f153619---dutisifisud.pdf In PDF document text
    • http://creatinglifeoptions.com/userfiles/files/43141486889.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/pakugamew.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/15498847925.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/lenizosikurijatebox.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/rusozaperovape.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404ddfbfdf3---velexulifizix.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/13373760322.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/99385512079.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/80222667730.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wuxorajavakekuwefazebasib.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/10816706222.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/48565029341.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/zobivikalopojogepemopezow.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/25963228239.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613073e013e2e---giwulonapumuwivuxide.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/guzuvimumojixafowilun.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gipowawezufixegosolabo.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/gezosefapijokiretitilipu.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/93837087195.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/sabunotajuxodix.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/xebikepedu.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/sobelilogigudesuziwuxet.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/57128444370.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/luzutem.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/fibapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chrome+download+tabletPDF 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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 10508 bytes
SHA-256: 7bb490fe4b15f01be031922dace561366176a5eb0afadd0ae194013fcef13b93
font_01_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 16376 bytes
SHA-256: b8c7dc04a1599fb43844d5aef8a5991056eee9e9a5beea7a425e44f20518aa96
font_02_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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