Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4de31427304f4d…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 05:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 145052bc0650dcbe7cf6b7830419eb8f SHA-1: 7795a3963c5f22f943cc96b65b93137853451f70 SHA-256: ff4de31427304f4d7e387f6cb0fd14d2c699633d6c46d6993be8025940f77895
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=best+tom+and+jerry+movies PDF link annotation
    • http://elitsatodorova.com/uploadfiles/file/totet.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/47138234125.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630932880.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jitaz.pdfIn PDF document text
    • https://profesa.net/userFilesfile/dajubaf.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/64522019292.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f7d8900059c6f5372c7d363bbabc0f93/vuvumasavasagasipafunuvi.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/zorilaguwapetimoneb.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210929082947.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/78894002579.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b7491167d---bimogumilizur.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/95756753933.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615392f142fc3---pisiwezetobadogusimusol.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/50565329696.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/50032871563.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/xuvijofiwozopatet.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/49209697388.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/pajututiwikobero.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/sotikexozemonisiwaveso.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/311946981.pdfIn PDF document text
    • http://cloverdiamond.com/file/30093212908.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/73801519375.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210907_040458.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_off0000b09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 10728 bytes
SHA-256: 4bf0f6593fbc5e00048348dc2f3ccb0ce4c8c88ecf43a2c8d330fd53860ee8d2
font_01_sfnt_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 15816 bytes
SHA-256: 9db139a13193cf3cb9352d7696430ec4dbd25e263947451972aa8dc75aad233e
font_02_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1