Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f050a3eea15a20…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 14:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0890ca58fcb15eee03022ed3c692c11d SHA-1: b5f54ccfea80045b4a1cb1dca9915073c3bf6773 SHA-256: 72f050a3eea15a20480eeec5168c548610b12c2cccf58267be9d2310d61df524
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document body is heavily obfuscated, but the presence of numerous embedded URLs and a 'Callback phishing phone lure' heuristic indicates a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and heuristics point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kenkochaya.com/user_data/ckfinder/files/podefazorogupoli.pdf In PDF document text
    • https://luiginoiobbi.com/userfiles/file/10181135589.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/98074614774.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/47170898859.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ee5e05beb2fffa837788a80709092cf9/14818002065.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/91107912248.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091322455773499.pdfIn PDF document text
    • http://budropol.de/Upload/file/53060381916.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/jaxoz.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/tozatokagin.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/3203725800.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/69886531440.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/9646133420.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/28527641258.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/gakatazolejimuzu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161452b470bd63---riwamedasipujijada.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///79856178655.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/walevepedet.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/dujapukul.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/72542475901.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d7506d69---11474166511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+online+chal+mera+putt+2+moviePDF 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_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 17556 bytes
SHA-256: d85ea68ca5205fc8413f33ecdc1145446476299b98d63654d55b5cebccb33840
font_01_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 10752 bytes
SHA-256: f353f319c181dc635c1ecf3d7feb5ea91f0726be1b4d19247e50444fadcf319b
font_02_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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