Malicious PDF — malware analysis report

Static analysis result for SHA-256 97423c3809dd2091…

MALICIOUS

PDF

81.3 KB Created: 2021-06-25 21:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e693a35821273e09812939a9425eaa2 SHA-1: 32e6ea283d65c1adcd05e7be8e1edf980ccdefe0 SHA-256: 97423c3809dd2091e5b02aaee7a16676a5779ca70a31f0619deffd74a0ac67c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely involving the redirection of users to attacker-controlled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://axiomestates.com/userfiles/file/71129045247.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e44b6fbbc---jenikojadi.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e98510fa4---guworajorafivosezogop.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ef9a6c58174d948fc3b7a8e9672404ce/64630083011.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7de90ee43---sesoxebel.pdf
    • https://audreyheselmans.com/_files/file/17950255872.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f482083261---nexosaravoli.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/002b10685967eb2dd9ea7df000d12d77/lulalinononu.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083988bcb33f---81505509392.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4410a84839148e8b22c8f008a47e2217/bigitowasaponofodadirutid.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/b8jkk2nbq8n8kvirro80t1jiur/3546645541.pdf
    • http://polyalpan.hu/_user/file/siwisujujakamebuwiribolub.pdf
    • http://artpolinakuzina.ru/pict/file/besamojegijizawetugak.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6b506512---67985093147.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fe4cfd678d480aefc324cf47f86b3822/gitud.pdf
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25793803041.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608375ff8cc78---17902685532.pdf
    • https://patc.fr/imagesfile/zesoketugod.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607125c869f64---79148653685.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea084923be---zipiki.pdf
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/7665265093.pdf
    • https://ludifrance.fr/userfiles/file/86254691057.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56833e49bb---rezomajugegosamedi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=discussion+section+of+lab+report+example
    • 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_off0000dac5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 16792 bytes
font_01_sfnt_off0000f2d7.bin
66ed148bee1dd8b0cdbfe336e881f4678e2b3a4313fcb900e95383c2471f51d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 16840 bytes
font_02_sfnt_off00011e91.bin
87884713d510d17b811a01bde7ceea1ac1a7c683eb3cee2573ebba9358bae123
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 10984 bytes