Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b76b8206705789…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 20:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f266d08437d5b8e4a5fd36d33e066bb9 SHA-1: 8f5afbb012ba046422a956497ec5993772bd7053 SHA-256: e4b76b8206705789e24c550a02926f397d4e0e1877e3ccf7d91510a31aa25cfd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to attempts to obscure the true destination or leverage SEO tactics for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=pokemon+black+rom PDF link annotation
    • http://3asoft.vn/img/files/36297648850.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/21950830547.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/61eac69d4b7420116538e877cf674221/midugidevodojojifadaja.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/rodokafejojibajo.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210903_6C09183F7AE9EE43.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161319d60c653d---sokazebamafuza.pdfIn PDF document text
    • https://hiroyoung.com/data/files/gorogapenikuvunajalol.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/9310390354.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/92537615726.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/32490311964.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/kasevefukenebo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a116ff21a4---4239095389.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/fifoximerurevag.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/9008005249.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/43138226047.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/vepewubodom.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/24816225093.pdfIn PDF document text
    • https://clickbox.ro/images/file/13943142312.pdfIn PDF document text
    • https://taperagi.com/contents/files/teginigob.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/74746170583.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134222612539---xupisemabis.pdfIn PDF document text
    • http://placc.info/up_image/35661504787.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/gusemuzidevetiduzuwixanis.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/86203853942.pdfIn PDF document text
    • http://apicn.net/upload/files/43398953043.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_off0000c12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 16444 bytes
SHA-256: 54fb3c16cb4149790b0e770f0a993ab8a075023b1e42a54bcaaca6761a3e123c
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10264 bytes
SHA-256: c399889c503d77da39eec52bf9e9144143b013e922ba3d2b1232fbd7746f7924

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