Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da1a7493b82870d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 07:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 92a7f503a634e68e5e37585dc41623fc SHA-1: ec8548b708051892bdfec21344b54be06022f443 SHA-256: 2da1a7493b82870d8b7e6a75b8b41ee9e12df1f32bd11b37b085ff4c505a11d3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including those on potentially disposable hosting, suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f4fca0032febf2fef2bcf522163cf6ac/94693040972.pdf In PDF document text
    • https://luminex.pl/upload/file/fevapetobikinozusosil.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/luriwomikolitogalefo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305a18a818b---vilasekofuzip.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/somoxomamedawivolilok.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/55522619814.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/71422053493.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/24145753880.pdfIn PDF document text
    • https://tmtteks.com/files/49467548431.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/zozavapulazap.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132caa709985---xaperuwamokofedezetu.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/48534364228.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/43536306405.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffdc98f96---jididefuvedufidew.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/70734796751.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/pezolofagavabas.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902055004809974.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/70080231198.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/xizopikutojafomuratosow.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/14358351492.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/lusilije.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/jojomiwelok.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/josovebafobin.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/paxuposedizegukepopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mathews+medicine+7th+edition+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_off0000bcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFB 10868 bytes
SHA-256: 9cbae520c7dd1ff180e62a43c9e5aafe74ea6a2100ee19e4e47e8be740f15513
font_01_sfnt_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 16996 bytes
SHA-256: a4f937db5c9cffc225c43c920983cb3753adffb3dd5788b91723a91782c7eb53