Malicious PDF — malware analysis report

Static analysis result for SHA-256 f617588678f7bcdb…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 10:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1168e44acb814890f919a16fcf302a3 SHA-1: f648aa6bd22c2c80b49f0374529bbe579b9530db SHA-256: f617588678f7bcdb10ce8669ba6d3e3968649481fbca7842562e86949935241f
216 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including a high ML classifier score and ClamAV detection as Pdf.Phishing.Trojan. The heuristics indicate it functions as a lure, prompting users to install browser extensions or updates, a common method for credential theft or malware installation. Numerous external URLs are present, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=iptv+ultimate+player+apk PDF link annotation
    • http://laskod.hu/userfiles/file/jerolifigowilixove.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109110023121227.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/jazerimajobuvozepuk.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/rakofosotumewagofix.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cca165d497---kozog.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/69038117177.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613127cc5317c---nanakizivebojaforazi.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/57783929092.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/leguledarexowuneribibi.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/21385218646.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/wisaluse.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/93328169135.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/donojikarozerutisow.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/88932093383.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210906_BFBEE0E17794836C.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/13657884086.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/jdp5fa5im45kv3ms3i4m8butj3/tanuzu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/17827778079.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/70601890510.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/limunarijukuwamusofed.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/45987949873.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/disuterugudofusel.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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 19240 bytes
SHA-256: e64d6c09670b6c54580785c3dafbb742201b001f18d05510041f99faed3989dc
font_01_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 10344 bytes
SHA-256: 0102a2b407ea60e75750091867185ac05356edf39729df8084f463921a35b40f

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