Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d0bc94fd897cec…

MALICIOUS

PDF

128.5 KB Created: 2021-09-03 09:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90f9a440cf770d148d1938a6e9aee289 SHA-1: f6a17b0654b0f017aba868bc02a4b23181438870 SHA-256: 20d0bc94fd897cecf6477e254e32ae8e558310c7d077bba3dd7908d8dd4ed402
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains numerous external URIs, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or tech-support scam pretext. While no scripts were explicitly extracted, the embedded URLs and the nature of the heuristics strongly indicate the document's purpose is to lead the user to malicious content or facilitate a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=sr+489+manual PDF link annotation
    • https://hpsoft.shop/upload/files/niravafevixunoparipu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/bd9217072355698154d680cd44b16719/zefebiwigusugumifakejipor.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c047d7abce2---93732786688.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/dowatomapawavupudo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43e73771e7---kejifoguzofakeramej.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kenana86bvpobdqlsm2lcfdgr1/pugalosefixuboliduxaxuji.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/42182696658.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/64163681356.pdfIn PDF document text
    • https://servicepapik.ro/files/fejexekesobelaziralusege.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/wamopuvabakironi.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/foxobugosakubo.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/98772343374.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/41248354427.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/41843132268.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/susovegovivu.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202108282203091215.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/56955934143.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/88953553572.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/dimupup.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/letazo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/56494191801.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082c97352a5f---38859317841.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/71b828a8c078cddaa0bdf1bbee171672/vetolejilu.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/xugixigonudevilaza.pdfIn PDF document text
    • https://medtek.vn/storage/file/56721132788.pdfIn PDF document text
    • 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_off00018ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC8 10288 bytes
SHA-256: 18782678293cb59d9672a521ad508bd96923a480b699f4c3cef6723e08e5a5a1
font_01_sfnt_off0001a5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5ED 20704 bytes
SHA-256: 44fe252209e18add6e5af24ee4636711a77af019a967bd78a1759c85c104b7c2
font_02_sfnt_off0001dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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