Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ce0f2d0ba38792…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 03:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efbab4fc34efc79e3319589477b4f972 SHA-1: 3028660596dbba5c483dee113dc6ddee5bc7b0b3 SHA-256: 72ce0f2d0ba387921e80e1f41c95678936b42b12c85945dbdad8bc093a2148e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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
  • 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://chcial.ru/uplcv?utm_term=sunshine+coast+phone+book PDF link annotation
    • http://noahmission.org/dataroom/file/98204232271.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/69626999204.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/76706643255.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dogukasikigokunu.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/92952353707.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebec73d29---91868937280.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8128b3f7---52679502217.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/gubipoketagufod.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/bizexikix.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa6f5893e2---70304659200.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/lofodewudisotamuzefuleguf.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136c98cf0cbd---pejelawewesebinuvut.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/xunelofirudamok.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/51704701561.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202199743374754.pdfIn PDF document text
    • http://samtekelektrik.com/files/85402251849.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/91355650906.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/96661650384.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/54433735127.pdfIn PDF document text
    • http://www.polni.si/Images/files/kanatamasijaresijo.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/97791955188.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/gojenatigameloko.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5n3nllemqu4qseh4g9dord9ro7/83543316941.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/7095464667.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/9336557361.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_off0000b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71E 10732 bytes
SHA-256: c498b99e2c3d088138dac81732ed34794f6b44e8d590d8be59731f7cb999cc77
font_01_sfnt_off0000cf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 16108 bytes
SHA-256: c689cee1a6c4525f273f708f9401218dd6a9a138c0fd2444d6d5ccf4f89514d8
font_02_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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