Malicious PDF — malware analysis report

Static analysis result for SHA-256 60bf3ceb5b60ee09…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 11:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e540af8dda7c896b8a614b4f3cc6fe1 SHA-1: 9a0e0178ee74240fb112a6f0de46b3deea8d5f3c SHA-256: 60bf3ceb5b60ee09987a5ac3547d80ceb222263ca0d7ebf1050d620d585593bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the ML classifier's high confidence score point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.funes.gob.ar/ckfinder/userfiles/files/19941442730.pdf In PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/nukudulopizixozobuwara.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/63212478912.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021073113031086.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/um4jq175logkr958pndog8pgei/waduwulemefetadoka.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/24e34d4defcdcac1838f4649c6e79e20/30052320334.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/92924977542.pdfIn PDF document text
    • http://emaaravm.net/upload/files/97791270464.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/sagalis.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/35034775771.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/10oj6b1hlirri5ruhh6b17lmtk/vugatuxenovosilali.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/wopusaw.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///95578493930.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/23735807268.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/kixeb.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/36198089023.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/22514422159.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/pilowekep.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/42553083355.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a2966604---92575509050.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/fc6f6723cc68528d0ce4af08e5eb633d/runat.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9dde569d---51361340769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bsc+physics+1st+year+book+pdf+downloadPDF 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_off0000bb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1D 16176 bytes
SHA-256: 69bea8728ccf622e46574f9490fac2fb5fcbc0a5e2c40f8a890b85395322eaba
font_01_sfnt_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 11256 bytes
SHA-256: 87bf9f422960f722bf166edc02f700713c5613cf5532021bfdd44abbe196d154

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