Malicious PDF — malware analysis report

Static analysis result for SHA-256 965474dc056b61af…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 20:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8de71a195c7a9bec77aec39a37a3bb61 SHA-1: 37f4b21cf7f8a8805c3b68c338971631fbba8c6e SHA-256: 965474dc056b61affc6d29621c83c48e7d8c8bdf560424ec547f559018f56310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to download further payloads.

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 http://xpressup.com/userfiles/file/vebufebixakagikef.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098900d1cf56---8898954330.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210801082431.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3506806d181621ba3b220db99f9baec6/bomejosiw.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/46khsvgvkrd12jkjg07buptdnq/saxotupezejelo.pdfIn PDF document text
    • http://kotolantopeni.cz/file/3196764143.pdfIn PDF document text
    • https://bnovum.hu/downloads/donutaragalanuveburezopu.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/vefijonusuturu.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/49790904940.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a90358ee9b88e1f4fe0f2df94d5b138b/webujogajematiw.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3234a96c---12907553024.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/fomakekopiwizog.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3b8abba6---pefalimufigeb.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/wujexul.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/kizilixapokoz.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/56368791182.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bq1bgq509veegl33lv0fpmlksl/kifevisanewidezavape.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/15954610268.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/gijiwozerik.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d0542accb39---zewejosakokezuzitim.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/19341523021.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d95cbfde9ad42d5133a519aa082563d0/zofiruwo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797b0e0e129---kotofemoxidisukapuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=microscopic+examination+of+sputum+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_off0000c53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53C 10932 bytes
SHA-256: cf112046b15812a618d632142b6beaf503ff3a733ac77bf5c1e591805a21c9d2
font_01_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 17700 bytes
SHA-256: 746a0837eee3d1a7fcb6209a97d935c0e9a9311faee0ce235e6b49700452433d
font_02_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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