Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef18ff5031cc82…

MALICIOUS

PDF

91.8 KB Created: 2021-09-02 21:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fdd3862c96d0c641b7e935e6bf6bb292 SHA-1: f03581331565509b996e44c75d78f2d60f6fa792 SHA-256: 3bef18ff5031cc8201f56bdbb532cb153b937beee37c721c29b0f162f6eb7591
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://studiotecnicomaglio.it/userfiles/files/98199223230.pdf In PDF document text
    • https://bbmint.com/userfiles/file/53684666264.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210811055425.pdfIn PDF document text
    • http://mextro.de/upload/files/dinag.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23be5b05d---nodirapajerabimutenogeg.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/180fa04337388b56e03246be8a8b4dc1/gebatigabofani.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cc9f31ce1a1ba554306a3358da9ac654/sukufibadixufifewegoremi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ab835c61a---nolefipekapifaxezuxi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3f45c0ab32f47324ea00e88c8940d4ec/nisaxuluwogitovanari.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102d1d7a7f18---28826648813.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/depabixafofopabolozitad.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc5c817d14---34125686166.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba38a105f---mapisijokuwojudasoni.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/2395644387.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/vofaveru.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/mepelexoxazuj.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/db42e6a9d7029fba3c5d563e714e343c/28659067641.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/nratvbmu3j2004igf396c13oli/35485476609.pdfIn PDF document text
    • https://aneri12.eu/res/file/jololobafameregiwaxudi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/93465611408.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/76877911115637db6195b6ca01675d8c/wiritufafosuju.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/buvomokosadifom.pdfIn PDF document text
    • http://iknow.pl/files/file/99757223467.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/oo29fcd6cc36vp45gkfmovs4eb/siribevikubebodozesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=manual+testing+jobs+in+usaPDF 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_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 10544 bytes
SHA-256: d734719e7c258587811a6e8529ebb081b9acd51d3ea92d54de3a502971d611c8
font_01_sfnt_off00011510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 19984 bytes
SHA-256: ce457f71af842fb0bb6564aadeea823627128d49164989dbd5a8b2f12c79a01e
font_02_sfnt_off0001495b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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