Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1a453840d40b71…

MALICIOUS

PDF

1.37 MB Created: 2021-06-30 04:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfee8393cee159e98d421bb63f15e05d SHA-1: 7401e4c2bb05c9cbd0b775d3b2c584fe827e7454 SHA-256: cb1a453840d40b7122abe567c659e9cfe5bd004df580a923cf0618ef37fd8c73
204 Risk Score

Malware Insights

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

The document exhibits multiple high-risk heuristics, including a clipboard command execution lure and a password-protected archive lure, suggesting an attempt to trick the user into executing malicious code. The presence of numerous external URLs, many pointing to compromised WordPress sites, indicates a distribution network for malicious content. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier clean score 0.0534

Heuristics 9

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=wheater%27s+basic+pathology+6th+edition+pdf+free+download
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/bf56e189c1ce5c8fede3bf51c8a5c53a/19798852107.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608672b8076c2---2177908454.pdf
    • http://cyuanmei.com/userfiles/file/dofutonuxakaviravare.pdf
    • http://rasmesafar.net/basefile/basefiles/20315115027.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8ff8c78517291dbd2f186675f13b661c/49346291944.pdf
    • http://baaningdoi.com/file_media/file_image/file/38722071935.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b1d31613---61698181690.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60c42417f---89351940405.pdf
    • http://youngshiny.com/userfiles/file/1621753126.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/poxosawarubozeniro.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0171d97a40---22545293234.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/roxevotodigenewunogef.pdf
    • http://angelcabrera.com/FCKfiles/file/67181618030.pdf
    • https://alice-immo.com/userfiles/file/56090479920.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/06c2560258ef43bc6ed6f6d9470ff933/70268717403.pdf
    • https://sasalidayanisma.org/uploads/file/78323027565.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/ragokifegizivaxi.pdf
    • http://kidneytexas.org/clients/861060/File/37846737544.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8592e0adb---90092283263.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/70ae368b7eeda92abfcfc952b164f527/jaravedubujimulo.pdf
    • https://chris-arnold.com/userfiles/file/tosixowa.pdf
    • http://novussiteyonetimi.com/uploads/file/tevuromobepobode.pdf
    • 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_off00156363.bin
d64a28ef55329168f42c14fea831059a52004adba126a36b350b92ce3682ab37
pdf-font-stream PDF embedded font (sfnt) at offset 0x156363 11432 bytes
font_01_sfnt_off00157e13.bin
1b6d8f0cf4f8afad44983c2740da5342e665beb1f8d520751cf946d2413d5cdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x157E13 20884 bytes
font_02_sfnt_off0015b556.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B556 16792 bytes