Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aa8ed8c760b0d4…

MALICIOUS

PDF

81.2 KB Created: 2021-10-09 09:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d760a482400a5272f54c0c4ce9c733b1 SHA-1: fa98ecd0223fe0ef0ff2bf33c6be4e92f0a61e72 SHA-256: a0aa8ed8c760b0d498c582f7169ebfaa117ba2c480ba99bf27c9c155c1296ca6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=how+long+will+it+take+to+count+to+one+million PDF link annotation
    • http://vonschickenfremont.com/uploads/files/72127666391.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/vasuriparubusodokemegev.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/91737003242.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/55072517222.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/tukudelutawibozuvumo.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/fazefetebutozupifipab.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/kaluk.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615628d3cb3e1---soneketirafifibozazifaf.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d9bd98b6---14275157770.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/2993301755.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a6a070a04e8a36a388804e33612bd67a/85358358740.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/80172577813.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/woreju.pdfIn PDF document text
    • http://sdes.in/uploads/lorasonejefivebetetak.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08eec07ba---puwivopujesopatinowewa.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/85475292788.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/36789304230.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/jowisoneruporufol.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f0e26e7468ba8c6f1328547ff9b8e199/70066525814.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/vizodujudar.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zibipofapejatisali.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_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 18520 bytes
SHA-256: 7cea6ad3e9e37541f229c5db023963d1efec10d801a6274d235385fcdc61efaf
font_01_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 10576 bytes
SHA-256: 846e6c64f6649f5b6b9af24c783221c7dd896b339fd8dce75fe26d64f9b25782