Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ba330d6d2bbbcb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 15:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0666b27acb62e8d60f14d9e4bf074ab6 SHA-1: 43ed62055e4bf6dda20945cd4236db2b28fbf0a1 SHA-256: 72ba330d6d2bbbcb8a27f902e8cfcb4f4176731fb855bacbaf17a62ae32f12b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infotechsystemsonline.com/ital/www/img/file/kejuzufomabudusonivugu.pdf In PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/53304462142.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109021812109706.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/17547503298.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161413f6ec8253---tilirojovevufigimebav.pdfIn PDF document text
    • http://anpo.vn/upload/files/34359755365.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/27672046961.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210908_FFC8EE11EBC35E01.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613753576e795---rikizekaxinenamosenewutoj.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/sixorida.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/gapabudejodiwipefufab.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/17094016840.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/10124284064.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/tenigu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2084952ecc5fd9ae9b6f88a8c729b7d9/71067263972.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/32156555704.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/63717529558.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nulna1amhgv9th022bmp6gliqb/76101550351.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/35506432989.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f3d681b7e27aefe9dad2cf91382acc80/juwukepaxorimovara.pdfIn PDF document text
    • http://leton.pl/userfiles/file/rezugax.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/96905302312.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/komuda.pdfIn PDF document text
    • http://skolky.info/foto/images/file/dazim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mega+unlimited+storage+mod+apkPDF 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_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 10920 bytes
SHA-256: 6435b0edb8f8bb748dd9d721cd21443d92ec2f1f02be14f2d38941ee0950561a
font_02_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 17404 bytes
SHA-256: f96c9f5403e2212025f2ad9b7d6aa3adedb120164ee39a0166d7e4c25583bbf5