Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff19bcf5eccc5052…

MALICIOUS

PDF

92.3 KB Created: 2021-08-09 10:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06656111f4d4d48f6d892d1dcb9ef8ed SHA-1: 578aec1bf5c7b93d29a195504341ce1ec58a6a3f SHA-256: ff19bcf5eccc5052c28e83fa12939054003417dddc30782c27d6043f759f3719
292 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1553.005 Security Software Tampering

This PDF contains embedded JavaScript and multiple links to external PDF files hosted on various domains, some of which are flagged as compromised or disposable. The document also contains heuristics indicating instructions to disable security software and lures for installing browser extensions or updates, along with a password-protected archive lure. These elements strongly suggest a social engineering attack aimed at tricking the user into executing malicious content or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 11

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://mimpishio1bet.com/contents//files/16079847706.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d5a085c09f94b9aa444d6970055f24a4/joruzumemateri.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ca68365a---58610647533.pdf
    • https://monographie.com/ckfinder/userfiles/files/jutifijutusukumu.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ad462c0cf87b4fbb495e6cc62f152eda/85460604583.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/34816271408.pdf
    • https://atlastoursntravels.com/userfiles/file/wevegetopagiwavulujisapa.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608484f6d8ff8---42510540102.pdf
    • https://annjulieskarpmo.com/userfiles/file/30928020401.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082367b3fc5b---bubiwedamomaga.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/j27jditfmpig7514t9du9kjrgs/3363809469.pdf
    • http://getem.plfiles/file/sewexikojukiwok.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/mimevafup.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a9ff85934---zimulekepuguwijatok.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/pmgrjmhsb8kqka55ju11873fo1/buzovulewibija.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2df84d08d7---52567005285.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855ab4de954---33877224949.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7c5c8046af7dc9b823493576dce63fe9/76217252310.pdf
    • http://health-bridge.in/upload/file/13781873304.pdf
    • https://anukulagrotech.com/userfiles/file/19971306376.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e1cebb6ed07b540aff34c45226d0cba3/namal.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941eeaaa6d4---mezanagenazoruxagabi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=call+of+duty+ghosts+highly+compressed+setup
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/87243023288.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73a.bin
2f07b30ac4d37f9d10a3d78d695095b2451d8e5a604ed38c7551a1625d330a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 11208 bytes
font_01_sfnt_off00011150.bin
b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 1948 bytes
font_02_sfnt_off00011a53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
font_03_sfnt_off00013265.bin
28461e7bf7b8496c1cbb2720b6f9decc7ccebf3d1730a13cf8658be1dd1cf39f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 18024 bytes

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