Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f2df4116e4f422…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 18:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c71bfd3263911f18475411f8922bdace SHA-1: 8ce5e1c9c8bec36549758ebcb3d10075c27664a4 SHA-256: b1f2df4116e4f42292c7a36a49f1cc17dbb2d084a30707395db0eeff3a5dad50
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The presence of a visual download button and the link farm structure suggest a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=download+torrent+the+walking+dead PDF link annotation
    • https://arab-hams.com/Ups/files/85133508697.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/tixixivofozova.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/38808442066.pdfIn PDF document text
    • https://atl-50.com/files/file/rodegamufafoxoxedoziw.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/panosulefidodel.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/kobumodip.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///webojamiwonijabavokav.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/42d5429ad0927e098b6bee6e1a9766af/18925240294.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/vexosobagesis.pdfIn PDF document text
    • https://esz.jp/img/editor/files/7499958961.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/melakamawaxigofabiwo.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/19939441399.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/7110b462e4453b3786f4ef7dd3b7a097/6256342392.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/63706075486.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b45b82ee8c---peligarafusavo.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/38150631505.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913044717548841.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/vezedajawejoxufudibazokow.pdfIn PDF document text
    • https://777mto.com/contents/files/nipofokifijefikolex.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/jademefovaduka.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021912_6441_968.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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 18808 bytes
SHA-256: 43b42158cc2cc47c208e6188b3ce2ea9440adf8609b4491b4e0e5fb0dc5c8ade
font_01_sfnt_off00011609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11609 10540 bytes
SHA-256: fc359c14f9c301a25bf91080096323f076f070a6163b3cb2a7cef9f1d1ae987a
font_02_sfnt_off00012dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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