Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce9353ad15fc662…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 05:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 873288b177e17c33825e96ca5abecf0d SHA-1: f6112d73f680395c413393be0c2b7554f9450fad SHA-256: 6ce9353ad15fc66289db19202ab4f162ba4beb92c66b856a2434a70c138647a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model returned a high probability of maliciousness. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=demon+slayer+addon+minecraft+pe PDF link annotation
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/a8vagh0a3ibsu907o7lno752h4/kivijujumiw.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/21828092700.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/def06df5b1c09e910269770e12e8e737/47345040790.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/tinozolewarebotopevaf.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pevizimeboleruf.pdfIn PDF document text
    • http://tai-group.com/upload/files/vafixiludazepo.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/fozuj.pdfIn PDF document text
    • http://kccmaul.com/files/files/koxufaxexixavonuvu.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/75558540673.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/75960478821.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6fb8a7081a7dd02c7085f2e12a4dd4dc/68367330502.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/99770137862.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/31596830043.pdfIn PDF document text
    • http://shophouse.info/images/files/95234192295.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/xikizikemiwadavodawemi.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/vusejadimuw.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/fitepuzawe.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/tejuz.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/jolewo.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/lidokix.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/33475750824.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/natojidewoninifa.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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 10896 bytes
SHA-256: 3ac8014e775f28f0f7a2e1187976aefa030e0299c24d2bb2652e120a8367ddaa
font_02_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 20748 bytes
SHA-256: 122a7e1145c9e7ee8e747dfec16a19eea508c36f7b6cc83043d38f8ce4e49c24