Malicious PDF — malware analysis report

Static analysis result for SHA-256 810e6177c54ccc9f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-15 07:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62f433449932b50b691b98762731a063 SHA-1: 11b64385ba1677db367509ff7d7a1be8d03c2462 SHA-256: 810e6177c54ccc9f909ebeecbb67e7eb86e34c928475773fb5bf5827ff17717f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kirilmazbardak.com/userfiles/file/safevenewunugumujafoket.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161413995ad790---21644549180.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/81253293693.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/zixotinobok.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/64752614234.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/wegeri.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dceda42a68---fegafasovexivove.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/wuzafek.pdfIn PDF document text
    • http://chinalabware.ru/d/files/bufulavafotibu.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fidatejefu.pdfIn PDF document text
    • http://ladna.pl/user_images/file/34647119493.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/38840273640.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/zefisaruziwigu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5a58c7d583b1461fe6e2435cb32e827e/finuno.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/xafitetunewizasowajiwonog.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e2270c8d---93603961305.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/kuwetalowixu.pdfIn PDF document text
    • http://www.bash.cl/media/file/96800529037.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/749387193613dfccb5523c.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/39414146180.pdfIn PDF document text
    • https://pr-dienst.ch/file/97167552337.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/63891350135.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/wutasasusug.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/91a5370e4dff0b39994df95b7778232d/31816893768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=voice+changer+voice+recorder+apkPDF 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_off0000b79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79F 16116 bytes
SHA-256: b89f6f302af9f046ee85288f8afb033c4b8710efe1f6dfc927ffc6a3506caa7a
font_01_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 10608 bytes
SHA-256: d41c8d8833ac7e7f6b1819e60f7c791a01ed93cd7ca4b3e7114983ecc005a927

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