Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad5d835a96fb244…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 04:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65013fe685bbe19a650e7aa0efa644ef SHA-1: 58bdbdae5e3c148daeebffd2c90e11f37e5d2b31 SHA-256: fad5d835a96fb24460078af08a6c862aba9e8895c38be8dcfdac839c017703ae
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It employs a social engineering lure to trick users into installing a browser extension or update, a common tactic for credential theft or malware delivery. The PDF also contains numerous links, some pointing to compromised WordPress upload storage, suggesting a link farm used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • 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://kystar.net/filespath/files/20210912073427.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/12c6469e30e99f3c6219462f1a1cefa1/35535726971.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/95449735212.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/tusalo.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/55990949403.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/52770408690.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/jomegagivakez.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/39428490831.pdfIn PDF document text
    • http://domosplast.hu/files/file/56317901518.pdfIn PDF document text
    • https://casaalu.com/luutru/files/25845499968.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/24406025648.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132295a2e677---72034084360.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/tevasiredutidagibi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/fefegovifuwunulemu.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/xazusotuvedad.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf61b7fb7---zibujoduzigupaso.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/24063125809.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_2BDB32F885D26408.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/39073186249.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/58310550841.pdfIn PDF document text
    • http://swhos.com/upload/files/60047696615.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/26014614697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=live+net+tv+chromecastPDF link annotation
    • 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_off0000b789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 16396 bytes
SHA-256: 77a6dd3b0f6f5d4b5a6a76b29c18f262129d3da1af383ba338b5e18f49b64438
font_02_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 10472 bytes
SHA-256: 06eb41d72a23e35080e5d55835ab407cebcefd65280e2d525769465ae0eedc84

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