Malicious PDF — malware analysis report

Static analysis result for SHA-256 f330d1ef3dcd7f7f…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 21:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 517e0240053e6d33ca561e28988fcd12 SHA-1: 47abe3f3fc463b8f82bb98bf7a3b597ead771ed8 SHA-256: f330d1ef3dcd7f7fc32732e92c88d68463ffb55a8c4592c66dde5b9d216a81e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://invest.pl/userfiles/file/14933738014.pdf In PDF document text
    • https://villadorottya.hu/uploads/frontend/files/5387999044.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/zuxofewalobuba.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a0501bb6e---zatutipewiwilozefen.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/nuboxeguvad.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/dofoguzudazajamazolavava.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s0tdo9qoknn6qahe4e2nl60ud3/rubusilobanapasebawi.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8i0js965r2la8aqo92orj5hn61/10953156811.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/1691782088.pdfIn PDF document text
    • http://email-database.info/userfiles/file/49822957785.pdfIn PDF document text
    • http://zkpower.net/upload/files/72601137040.pdfIn PDF document text
    • http://vo23.ru/upload/file/46498212878.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a88c1604efcb81cdf04cb9237ca76730/wavozitupexidij.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/51479309292.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/prkq76n3rj03n9b84k5jqjs0n1/87170577413.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/dc1cf41cbeef0daa5add20c74563b105/boretujul.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5c695fc56---gekeledufava.pdfIn PDF document text
    • http://calisnt.com/uploads/files/56129624105.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/zisifi.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/52162370774.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/buxal.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/25462018327.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840cefb6286---54231759726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=integrated+marketing+communication+adalah+pdfPDF 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_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 18452 bytes
SHA-256: 3885d110bae955d18c14ce92a95100d395d55578e9d028591710666fd766aba9
font_01_sfnt_off000125fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FE 11044 bytes
SHA-256: 0a5a8477e624c110b6dc632fbf26371da7f9e72e1fa030a973db42ad16225165
font_02_sfnt_off00013f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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