Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9380a7adf06f939…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 09:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f994a3eb85ecd802331a2b2b80cd69e SHA-1: 8862eb7e7790f0848e08dd281f948f8fdb9b27ef SHA-256: c9380a7adf06f939b730ac4d6635d39a1c695ba6f2d15b39cb29a0c809cdff28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://apz-arte.com/ckfinder/userfiles/files/pagesutoxazomazenuduv.pdf In PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/kimoziwonalam.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/tijijovogupudiwupirifofi.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/xejepulefiwaxinov.pdfIn PDF document text
    • http://fluorescent-training.com/file/tatubip.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/22759751227.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/dejazevazukarolovire.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210918082432.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/5988961056.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109181933492328.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/xesesazovoritag.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16150ffeab9d91---wejasi.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/54255622498.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f6b8ce8ab18d18dee27cca9c2abefb60/88201260921.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146af57328d5---7471706680.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/33870275348.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/89019469881.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161355985a0ae3---94887730915.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130581d85291---42636821086.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/bikunetonowofig.pdfIn PDF document text
    • http://montesantangelo.it/files/files/jamurexuvaxos.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/xowulunusadivaberikume.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/45587821579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+take+phone+backup+in+androidPDF 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_off0000b1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BE 10808 bytes
SHA-256: d9974fbfedf807263ca506153e5463793ba01c6e3b2b462db1c4cdec62a5bdc8
font_01_sfnt_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 14564 bytes
SHA-256: 8a1b21d2c9991f9ad365fce0a2216dc8e43c4b506d6b2c7868eed6f57c96d676