Malicious PDF — malware analysis report

Static analysis result for SHA-256 95007dfa5203b9c3…

MALICIOUS

PDF

75.5 KB Created: 2021-09-27 23:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 532da34d51fb2d10cfdb3fb3eb1db7dc SHA-1: c8be05cf2b0d21aa7c157299f6d664e9758c5624 SHA-256: 95007dfa5203b9c36d266d8a2a7d3213604ae1ea6ec28100e9cd16225df42e42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=android+ap+wifi PDF link annotation
    • http://it-hair.com/userfiles/64382819996.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145a1a9ba91b---42892883229.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/94818913301.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/1161599010.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/kotivijukiwiji.pdfIn PDF document text
    • https://securitydm.com/slicice/file/kalififexamisuvakonimuka.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140c34a3aa97---22694715591.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/96919750042.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/jejonevakuliraledavurilu.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/46272623100.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/roziwafo.pdfIn PDF document text
    • http://espicycooking.com/files/file///71105057771.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee02e2272d---pibanumiwogejulenuvowi.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/59876751108.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78b62c2e7---59466620171.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/kafijuxomenaludirulekadu.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/50162638724.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/13851429200.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/94965541571.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/89204240714.pdfIn PDF document text
    • http://gnox.vn/upload/files/15644242468.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/xexozadifazenizevegunud.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/xukipinafujedekojafal.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9d36be6dcc0056db09baa27c22268bc4/17026891943.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/rewejifazajatem.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/gewixexidoma.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_off0000bc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC14 21048 bytes
SHA-256: 09a5f763c98c4187250dec78c2440d006c7f5ce5a1a0a09ae2b1c4b0248b6ca5
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 10116 bytes
SHA-256: 3eea7f0df9eaef742f90e8c23082a5c7de42952207cf039e8f7f4ef03d35348e
font_02_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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