Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c85dae5a16b7f5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 05:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f38ec01782221e50770537875794182 SHA-1: 235449bca9d3abf86b9c3b5e69e7f4d6eb7b7983 SHA-256: 85c85dae5a16b7f5fc16f53a432d7f3b9af4e96b7a69cb047dae3bc5ad185e58
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is identified as a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://stfurnimart.com/file_media/file_image/file/51377508501.pdf In PDF document text
    • http://pazzo.jp/js/upload/files/paxavapakinov.pdfIn PDF document text
    • https://ms02bet.com/contents/files/zomowafemekevuzil.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350819caee3---42295240445.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/98134036484.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/ralojukonuroj.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/49349158665.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/76158495847.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/06faf7f3d853358e0e69c869c8c1f2c9/fejukidumowigopubet.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/67343625033.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/xatozakiwesafinimeliju.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bc82e460783b673cee384bc2c86fb0cd/sitajapiliro.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/vujox.pdfIn PDF document text
    • http://hak-al.com/resimler/files/31461979191.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/96958236043.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/pifuxiv.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/10647279903.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koguwanudatovip.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/tizumosinagowokati.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/dixetemo.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/lijukewemuzanenutisidir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=aranya+telugu+movie+watch+onlinePDF link annotation
    • 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_off0000c924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 10856 bytes
SHA-256: 68a4cfb1cb448567d21cdac8446bf0e647952f8b09cf884f2f7518b62b835f5b
font_02_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 17424 bytes
SHA-256: 2f3f70f6dd470671092fbf1ec531e98e1cb4e64213535a84e11b90f416add2c8