Malicious PDF — malware analysis report

Static analysis result for SHA-256 5387f51d4477ae79…

MALICIOUS

PDF

73.7 KB Created: 2021-06-14 19:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd0092ac759fa27fc5b3325e382a974b SHA-1: bbc029a67430e14e55efac6f4c173037cc9165c1 SHA-256: 5387f51d4477ae79f57f2ae5e19ced7d1809c22fe507feaba77002a41b392a2d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. 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 URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=level+f+unit+2+vocab
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/b8rbom8g3mvjcsmpe21r4040ji/57036085752.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b49846e800c---44200740694.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e534ce492a---90104615095.pdf
    • http://lavalnerina.it/userfiles/file/52853414161.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b7c2dd1a---xobukibipapusujafiv.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/426cbd397eae0c98cd56474f3122d0c7/85248917295.pdf
    • http://steakclubhn.com/campannas/file/16337634797.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6830923f---wexesoxokafusowelep.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c7bd5481---sagobojotun.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/ririboximesibubenajokot.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/9k3qi9higr9oomu68evbohl6no/salumopa.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ba2be73a5caae90b0cea86b402ab9a0a/42977073945.pdf
    • http://ekotop.eu/userfiles/file/67604372784.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7be.bin
8a5bf9a169c4571da1b87780b63fa69421749b7fff6c9f0584ef140a2dd387b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 4756 bytes
font_01_sfnt_off0000e80b.bin
c12893f4b7e10181e745d3503bafe04d144fb61ef020a083c0de36814a9e2223		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 10560 bytes
font_02_sfnt_off00010bea.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 4324 bytes

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