Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54ff1fe078cc6c2…

MALICIOUS

PDF

93.2 KB Created: 2021-09-04 03:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab8e38d8123c79bb7d934b121dd44c7c SHA-1: 595c5738b69771a791019d8911621c608f4a1d71 SHA-256: f54ff1fe078cc6c2d0d1950dc5e534cbca3b18c88275d4f389a5bc26746fbb9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'SE_URGENCY_LURE' suggests the document may employ deceptive language to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=national+antibiotic+guidelines+2017+pdf+doh PDF link annotation
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/68f436c925d57c04421250a007d23cfa/munoki.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/52076146275.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/ziguzijevabinoganukapi.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/99344563942.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c988caf70---50505073601.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978799e1cdd---10072370434.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/58364696857.pdfIn PDF document text
    • http://rld-carbon.ru/file/daneluruk.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/88024129737.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/46518882624.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/92863245749.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39b1bae08---23088499419.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/37903146229.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/lotugibenevowije.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608728dc018ac---nazewisufelesivewobik.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d69725ec6c7---zidivobededewegifuzased.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/51737916851.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/lezewusarolagapuzazijotuw.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/wovirigexumarobimijovixo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b29b8c4b---zezuzidejosadikirugebimix.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d967fb120e---beridirujililexokofe.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f23aad2c0dc55af2c0cf0bb5a23b1a1/67708235509.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_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 19896 bytes
SHA-256: ff5d9d9d2d9266461147f8aa58614c903f40d00826316e393a6cedec315ac419
font_01_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 11360 bytes
SHA-256: 053bcd90658f77ec1d6d2b1fb73badfddd9c66cc1bc0e85a2178f99320bfebb0
font_02_sfnt_off00014ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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