Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fa0de99b26cfe1…

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 04:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f45e07a27779d9d58df2296c672f7c4 SHA-1: e955796fc81694606b2f9b5930436a019084e711 SHA-256: f6fa0de99b26cfe11bd50382c2166daee2c4f744f5ed2dde40f1c79dae60532f
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains embedded JavaScript and multiple links to compromised WordPress sites, indicating it's designed to deliver a malicious payload. The presence of a 'password-protected archive handoff' heuristic strongly suggests the document is a lure to trick users into downloading an encrypted file, likely containing malware, after providing decryption instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • 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 http://umrllc.com/userfiles/files/79625498782.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/65bcfd9d45c87b456e50c639d52f64d4/zabisozedekerikibuwu.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608617fc1e5bd---89539625144.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af4096dd3---16944828785.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c57a24bf153---12612817752.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1324rnaupmlttm5h801dvq4483/19752985470.pdf
    • https://n-zvuk.ru/upload/file/masegidugupaluvosonat.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe2a1b9fa4---24704367825.pdf
    • http://hiace-yoshikawa.com/js/upload/files/mesulukew.pdf
    • http://mosjob.ru/images/file/gojuwugom.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e488eae5cd9f448d319cca8b6a88805d/golidukavipuponubo.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed4d61f6a---75704927269.pdf
    • http://karunb.com/UpLoads/files/bomemagepadofexevadekat.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/32387331298.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/945d1d69a46899dfd166536092f0785d/wosibubeti.pdf
    • http://ahkkpcm.org/userfiles/58945071801.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16235508645599.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160974067ed71c---favukulizejo.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5mjq2qpejnkvpm0l08laukbnq1/10393354465.pdf
    • http://www.anclupnapoli.it/userfiles/file/93493853082.pdf
    • http://africareview.in/userfiles/file/21376117921.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d268fba2d0---nekezebuzinabikadajel.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/rarejewurimajubula.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bc117ac64a7---13910717968.pdf
    • http://asustainable.com/global/file/63540734206.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=3ds+max+exterior+rendering+file+free+download
    • 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_off0000e6a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 16792 bytes
font_01_sfnt_off0000febf.bin
c8ea2fdde12ca4321349c7ca418df2a90d6f20129b39fb9644cd02f3c8d194a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 10960 bytes
font_02_sfnt_off00011800.bin
81af8227afac9eff8e3b495e3b0c340d1d0f6476ba3104a10de5201f5fa6a269
pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 17024 bytes