Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dfbbbb5dad38d6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 03:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a42d92004881f258b866685af9b42e0 SHA-1: 162c2547831ed3a668a186fc63f223c3a7db6fc2 SHA-256: 05dfbbbb5dad38d674433c5f11d69b03ec1373a84d8ad1ed33cdaab0bb5a71b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting suggests an attempt to lure users to malicious content. The primary attack pattern appears to be a phishing lure disguised as a document, likely leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alshaabcoop.com/userfiles/file/64880516152.pdf In PDF document text
    • http://meetburgerusa.com/uploads/files/jilusawepokisifo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xizajowuze.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fed7b2e6d93---wevome.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160840bebe507c---gefamawafepikabujobawuso.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/28356912816.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/73840333241.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/25519967077.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/geronusedon.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8ea48c04---66073815670.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c6986a8b---mozax.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802791e6de8---7058740285.pdfIn PDF document text
    • http://ipllaser.in/uploads/71602728996.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/53817433616.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bfde1ae8d---62360439252.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/mq1ilgmfcvq1ud8onmermi6ddo/26383084226.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/bobonoj.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/22971838451.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/94835821948.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/84652359958.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd38dab82f---97445373281.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/manilid.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/lutoguxexugoloxuzaravi.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/jifezaxasozi.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/dodokuzajusafabosamiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=metric+units+of+capacity+worksheetsPDF 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_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 10916 bytes
SHA-256: 16e059048f3aec6ce8ccc5c62ef099f18c49c97b49004239397f79b7c5e0847a
font_02_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 17276 bytes
SHA-256: 01e7f60ac515bf79de04ed4c30a2c332d02f06b5e0332379858821184f28763e

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