Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e97235bf9d53955…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 20:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d96c36705daa2af9013163107c906747 SHA-1: 91571d9559ad6585cbaedde49b7cee388b2802cc SHA-256: 8e97235bf9d5395565f7eb0a61e7779c0235a7199efa92a44d3360fafd38239c
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits malicious behavior by employing lures for remote support tools and clipboard command execution, aiming to deceive users into running arbitrary commands. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://allytemp.ru/uplcv?utm_term=cast+android+screen+to+pc+usb PDF link annotation
    • https://fiberglasssupplydepot.com/userfiles/file/dawipomovakato.pdfIn PDF document text
    • https://bfull.ru/uploads/files/vawulodorimimasozurojave.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/10369133321.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/74686680513.pdfIn PDF document text
    • https://coevent.ru/upload/files/zegovupaxukime.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/rizapizap.pdfIn PDF document text
    • https://megashina24.ru/files/files/kurikibubaz.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/wixedusubuse.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/56289588634.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/83391895272.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/55912802301.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/68100845151.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/nifiwukilunilevubupawopor.pdfIn PDF document text
    • https://ptogel1.com/contents/files/91022884999.pdfIn PDF document text
    • http://agro-partner.com/Image/files/68865101384.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/74743183294.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9bb2e259c---68960820697.pdfIn PDF document text
    • https://aaaxxion.info/images/file/vivenorazafore.pdfIn PDF document text
    • http://alkanboya.com/files/file///gegejimufepugojelukawer.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143646408deb---vukajivirogizugudazutopiv.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/7671649426.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145547f5c602---5060704479.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/digemunasotutoduzox.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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 18332 bytes
SHA-256: 14d757acd06dd6b719087861c870aa60a8a1d77ed234f51e0431ce598309afe7
font_02_sfnt_off000138fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 10732 bytes
SHA-256: 846f2979b5be867996bd35d1239ca73c30950d0def9ea36db1706b641da03a60

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