Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe86305688726c80…

MALICIOUS

PDF

95.2 KB Created: 2021-09-17 04:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6fe7bfabacb02a1294943737fcf6aa7 SHA-1: 50ed0dd9a763f2d0192aee90b36c4f32c458fd92 SHA-256: fe86305688726c80cd82a6cf2310e1b1c94271d40dd5fb0fd87a2a97d0db1356
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The heuristics indicate a lure to install browser extensions/updates and a lure to execute commands via the clipboard, strongly suggesting the document is designed to trick the user into downloading and executing further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 8

  • 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
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=open+mhtml+file+in+chrome+android PDF link annotation
    • https://e-fasteners.eu/media/file/92573398154.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/besupefu.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/mimisutovidatetora.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/436a83736a89fd6558647fff558ff498/57311957269.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/misogojamanaverox.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/12477721434.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/36220324526.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/c9baslni7d6qn58qc1gmlajmd9/nuwixiw.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/nadiveropiwutikak.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/zalapawijazamutisapibi.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/jawenazimuf.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e22bd342f---55290106835.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/mifolub.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1l04mme5od179kajl346g1bgl2/dupuxiw.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138420aca90a---16059021490.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/53590296705.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/75864548422.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/wutetegudipemexize.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/68058540503.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065bb81680---31324597634.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/21989175675.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210903010205.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/xesudubof.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/mewovuxefafuje.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/fugozoguwadutodopuvatoj.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/86712071929.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/raduxeliverodefebu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 10740 bytes
SHA-256: ab7136f83bdb45d626aa2647f35abb676093bf6260549e3ffba5324389a0335f
font_01_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBF 19256 bytes
SHA-256: 151906162d6f17e9c07685968c5bbf68169c3ee8527ec1b5de453da87b51ab97

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