Malicious PDF — malware analysis report

Static analysis result for SHA-256 77168a062872060a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 16:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dc89b79f948cd0e191130ac215370a5 SHA-1: 0921f50208652046a85e5be516493ced8ef8c3a4 SHA-256: 77168a062872060a77dfdbf234e85928543df120f553e906edd71ab471655661
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 WordPress sites, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a link farm and the nature of the URLs suggest this PDF is intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://petala.gr/userfiles/file/82420618831.pdf In PDF document text
    • http://szyoujin.com/UploadFile/file/20210901121403074.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/kapokexaxo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aef40d97e---pegufefotagilobubalojuxo.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/nakatojaxesubibasazu.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/xenosobe.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/fupoturatosirifamorunox.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/43289509151.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/veburuserowupaxapumimapo.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/numedo.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/soletemagerifa.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/kosepijusibozokopal.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613745d5e1b8c---luzuriva.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/30647140876.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/mejonulusitewupimodomon.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/83216384745.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16315932436870.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/125257ee4df3cc8f4c2b31f6dd2d6362/51627525344.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/81618161490.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/jizemefonifusiv.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/xuvibesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=downloadable+games+for+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_off0000b0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D9 15080 bytes
SHA-256: ad0b0b1227001feea1bf6cf21ecda4167ee07f8f67863e7a0eb486f5d6c8f26e
font_01_sfnt_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 10824 bytes
SHA-256: 070511829e9bcd23e77318931420938c54c44709ba1a21a3ab0cbd60c0e1286e
font_02_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1