Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5d4c1195a3cfc4…

MALICIOUS

PDF

90.0 KB Created: 2021-09-19 02:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d22707697dd802ef19be9cabe90ca47 SHA-1: 4c6474772c8e2289e25223e47d57f28d500d59f0 SHA-256: 3f5d4c1195a3cfc4b83eb24445f702339f481f831cb4c80c2744957e4f8e4755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://asiastudy.in/ckfinder/userfiles/files/19645544325.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c68ca32b---21797811356.pdf
    • http://goldcoil.com/uploadfiles/files/96642358431.pdf
    • http://cpviettin.com/upload/files/fadivuke.pdf
    • https://proxkimya.com/resimler/files/24909812461.pdf
    • http://strategie-online.net/catalogue_dynamique/file/xusaleruzijus.pdf
    • http://choragwica.pl/userfiles/file/93373889679.pdf
    • http://cafesezony.ru/fck_editor_files/files/musotozarigelilokifedaz.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614309168618b---binivesepirunilefadufuraw.pdf
    • http://imbirimbir.ru/files/fiwebidesomuvakavajez.pdf
    • http://ctcinsulator.com/uploads/file/21993573881.pdf
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/51668974487.pdf
    • http://01host.ru/userfiles/files/fidigofagirebaf.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee96c4931f---kizakakizanadokaxag.pdf
    • http://bestbuyfromindia.com/userfiles/file/xewitigubezurejuxolokib.pdf
    • http://ccsl.asia/files/92832000734.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/3037989887.pdf
    • https://0286869143.com/editor_images/files/nuvigemuzuzazaduxibe.pdf
    • https://cailux.lu/userfiles/files/luvoxetepirugozuzamojowi.pdf
    • http://lamorenj.com/userfiles/files/jupevipasexelarexisa.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137693aeee14---14582301024.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e03d30d5b5---vejokara.pdf
    • http://resortvillairene.it/userfiles/files/tumavazuxasibapasabakazas.pdf
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/54427494722.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+turn+off+system+ui+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8bb.bin
6b5bc9678fd5aed32a6408be9bc32e3b238c11aec70a090f80de9d6f007f768a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 10760 bytes
font_01_sfnt_off0001118c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 16792 bytes
font_02_sfnt_off0001299e.bin
6a227b8ad1cc46113c8d11cb7de7e2c22fe43b86e75a66f83169f606f745c123
pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 18676 bytes