Malicious PDF — malware analysis report

Static analysis result for SHA-256 931a4b7173a71556…

MALICIOUS

PDF

87.1 KB Created: 2021-07-06 12:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efc4aa4a093971e193048b3235ec8845 SHA-1: c23d393f4d3905adeb23eaebce686f4d24f9c84f SHA-256: 931a4b7173a715569fd86f7f48f695156475b77ac19968ff2b309fc2b6adcc0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains a lure to execute commands via the clipboard, instructing the user to paste content into a shell. This is a common technique for downloading and executing secondary payloads. The presence of multiple links to potentially compromised CMS upload directories and the ML classifier flagging it as malicious strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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
  • 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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6271036d9afde81f49386603b450b3c3/funopuva.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbacaf145---77292809331.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/fatadugedonapemikak.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d6149a63e---55257395233.pdf
    • http://rzn-house.ru/upload/file/davotutexix.pdf
    • https://sasalidayanisma.org/uploads/file/67417512165.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0de04ae7---52508521229.pdf
    • http://bangdientunhk.com/upload/files/50781859509.pdf
    • https://sunnyvale.com/wysiwygfiles/file/kezojomolitud.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/233749b3442f8255f20db7d7a6b5ae58/wijupum.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/58900411282.pdf
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/78265969912.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d69e27820---34742450903.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607918216166a---57219973682.pdf
    • http://orsini-blasioli.it/userfiles/files/pebusiwobexazoja.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609875d11b68f---popojeki.pdf
    • http://dailycan.com/userfiles/files/84272247463.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/dazapuxaxat.pdf
    • http://yaeram.com/userData/board/file/nulagisura.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a3df4df2c294593483d9d32007224599/pofojozutirugotaxo.pdf
    • http://asbazainville.org/userfiles/file/67570237337.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bloons+td+6+apk+free+download+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 16792 bytes
font_01_sfnt_off000102a6.bin
96d8a99ea303608265e19d0cbee42f8f09a7f535b54acb3fd25c4a479dfcf075
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 19856 bytes
font_02_sfnt_off000135b3.bin
17fcac2a57bd57d3bd928414e672ae693d1984f0bf63c52d80ca450e7f9ae4a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 10920 bytes