Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbf33b41a328a69…

MALICIOUS

PDF

90.5 KB Created: 2021-09-04 15:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0d00d106eb6355f2ef031e62548b560 SHA-1: fc35e041ce7fe85cbbaae75cd4e410b86b5484d8 SHA-256: dbbf33b41a328a6921139fc7b0a521b57623a830088549bffc260c4a0aaccfff
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 CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d6f6ab06---poxiwukebuleteli.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/12f66dfdf935107166e81bcc8bf358af/pupiliputeweveruwux.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/zanujemodisifomunasovaf.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/xavudasadured.pdfIn PDF document text
    • https://tomas-music.com/contents//files/nobegot.pdfIn PDF document text
    • https://europartner2.pl/uploads/dowafuj.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/78792627067.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee22aadbb---kunupufub.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094d23e148a4---9803999918.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/dipuxametivoguzasimetu.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/bofefiwagowela.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb0064973---xukeferolamu.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/f41d756f21413d84f13b96104e9dab95/vunelafuna.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/8bc8bf102d0bdb48517ac229e632d737/93510543766.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/falokefugor.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/25252260076.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a9cbdbb68---59088251274.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/ledafo.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/73153230043.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/nofuxo.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/57739058601.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/jedorelus.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/detudel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=etiologia+de+colitis+ulcerosa+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_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 18776 bytes
SHA-256: 2306c31f6821c09a63f0316cd68c27c2e6a7bce2d9421bbe84d8f0c1832cc115
font_01_sfnt_off00012b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B74 10772 bytes
SHA-256: 17b1f3baf7f1269482834be9720875071bf1fc3e9ae6b7414945671e0d21c72f
font_02_sfnt_off00014428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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