Malicious PDF — malware analysis report

Static analysis result for SHA-256 99922cb54e9c15eb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 06:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc3fa1d5a5730b6511ca44e5014eeb98 SHA-1: c559e1b6608f066d44f3fc3924ddfbe4e1c2868a SHA-256: 99922cb54e9c15ebbdf4988cdc45ac547a32243c5a2e50b691d323bffc264153
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The PRC/3D content heuristic is also noted as a potential indicator of exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607300fce4011---waxaw.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1afb8d30a9---peziregakamabaxozo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f7315327---47373158305.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/38939547071.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38b9e758ee---3345457265.pdfIn PDF document text
    • http://klpa.net/userData/board/file/47634432244.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/litodosidumedozupixexu.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/wegiduwik.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/4165329920.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/vumuwiwapexamimakewifebak.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/74c05d3266f255dcaca6fc51ed79a82d/zexibesovaxizojepu.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/5562480409.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d337d63c8a---xidurokopokinute.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b069a1d999---gewawafuvosowidesuxolib.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/suzibibapekatagefe.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f5b7457cc---xivaboxajatabufidiviraxo.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/64631583186.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/27545647863.pdfIn PDF document text
    • https://istanajp2.com/contents//files/11356948238.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4c4059168030413ff96f8861f5270bbc/83432462036.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/41774335731.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce31994dd---pogorun.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/zanerediwi.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fuxuripenamikezajuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=matched+ebook+pdfPDF 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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 17176 bytes
SHA-256: 42e6cd31505b0c2bd7556375f5cab6930f2aec008fd67adc142fe7b30dfb4ca1
font_01_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 10432 bytes
SHA-256: 6d25febb3c2988168e7d8568c03dd81b10e8226f36619ad2c0881ada075efae0

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