Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d3c39116c352d9…

MALICIOUS

PDF

145.5 KB Created: 2021-07-25 21:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8def351e0b862c33d67a40004f1b10f1 SHA-1: eedf105ca848471ec5ed021835d9584f56257bcf SHA-256: 66d3c39116c352d9673f8aac8e6139132fbe8cb7a440d1e1c9285970af83b717
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, likely to execute a secondary payload. The presence of numerous links to potentially compromised WordPress sites suggests a link farm used for hosting or distributing malware, aligning with a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e91e33fb09013b8ae0101b579bd043a/14283463846.pdf In PDF document text
    • http://canxetaidientu.com/images/file/xidofitoz.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/11097145117.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/sopedigugezigewikazuni.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27cd68df1---58676127348.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/90051340211.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/vuqipc1pr3po6kc4vpv8kr84u4/jowuvajekonimubajosu.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/mamuwuporabatebe.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/15069306433.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/78lbg3m4u520o6osck7a9ulec5/25200136087.pdfIn PDF document text
    • https://bio86.net/fichiers/71410221499.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b45f17950---dejunujosew.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0f7b18074---noxemerorejoroke.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/dazoguto.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cc94e8e7e---85692521883.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/25314207087.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609172c1935a0---gulorufumiwefilamer.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/37607499358.pdfIn PDF document text
    • https://micsys.in/userfiles/file/8803282491.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2835c8e3---35441756046.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/415c9779ff28638cf3e41079da499b33/92587977419.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e4457dab---62794831950.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a072b2dea---55045924501.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd9afdc811---70432703221.pdfIn PDF document text
    • http://contextuae.com/resimler/files/14214403232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=kingroot+apk+for+android+11PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001aaf8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AAF8 23460 bytes
SHA-256: 934f9fb7c4fd89193b84221ec155b10ed54c6e156010beacc0439ae65815d341
font_01_sfnt_off0001d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4A4 19328 bytes
SHA-256: 36666b90ad7f6c2770af718d6e36c60168cf2bc3fc31a3d15f93ab4dff590b79
font_02_sfnt_off00020797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20797 10460 bytes
SHA-256: 7cf891211ef5a9c72100aeb6fa9dbf1c6b019d7470410dc576f308e8b442d01f
font_03_sfnt_off00021f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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