Malicious PDF — malware analysis report

Static analysis result for SHA-256 2843db006ce8a2db…

MALICIOUS

PDF

65.6 KB Created: 2021-06-14 09:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 08e32573f0ff7ee4b787ad5e5932ca4a SHA-1: b1daf2bf23ff8ae8bae89c14f62153c0a6e90e82 SHA-256: 2843db006ce8a2db9a2d7b41cce08fe8fd77b8a0e7655344f2b277bf9582486b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=adjectives+intensifiers+worksheet PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a9b5a1adc---lubuwunadozozobibuv.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/rejinebiwurisoruterafifa.pdfIn PDF document text
    • http://haphadoor.com/upload/files/zamejadenuzira.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608470d685d16---77104174033.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cdeb9df620917a0638298cf48556fa30/96115849040.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/pevopubaxenepise.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/87659826571.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e000ac38f7---logexikanexuzofu.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/misijabofawuduvek.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/6527449853.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2680b8d1---43944677634.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844af6b883d---fitujama.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a762830b87f---tozumifixanutelu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079019d0cfa0---44679746831.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/fapinib.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be14f0037fd---21855585892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 4936 bytes
SHA-256: ad3cf03c7b4b295cc48f01c875ca23c0c95d73ec3eb2d91fcf798ed0b177ad15

Open this report in the interactive analyzer, or submit your own file for analysis.