Malicious PDF — malware analysis report

Static analysis result for SHA-256 929fe468d545658a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 09:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d38a91e3018f9ef3cc5beefc8534efe SHA-1: 2440cbfa0fafca1a6da8b92e2020033ee4dd7272 SHA-256: 929fe468d545658ac1f4584ab6cdf9c699e6980a7dd3dac4989097d0bdad68d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URLs strongly indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=eager+and+anxious PDF link annotation
    • https://ajambary.com/userfiles/file/94987120204.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3f9b0917b9a9b7dafac9a1e3f3883564/24467826075.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/eb442b07918ca38f6ae4e94367588ea0/51091175548.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/wamewopegudijofax.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/382432bbbe3599aeeda6064e1746bbb7/malinesamimafema.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/6810368056.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a1c80b35d---jegepafejelafavatijik.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/en4sljr9uguv03npkua7lko1sa/58545179771.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f48782c0b14---kazapojuworagokivoragazin.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/ripeti.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d1e439efd---dezizemuvapagodib.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/dixavugagaxedak.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/74d2d749c396630c033cbddab18cd630/14688302935.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/oi36ofqn50pefpkkrmqlh852rl/fawatabora.pdfIn PDF document text
    • http://vodnik48.ru/content/file/81727390126.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a9daeef0---gojorukepokuri.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/nokazeneponobejimosune.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/54236992854.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29043e27ed---jazukelaviwo.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/sojirutixobujeledo.pdfIn PDF document text
    • http://kelvista.lt/images/files/sugufuwiwulefanokezabab.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/5010145307.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2422a657---nazujewomaragobisosareg.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/anvd7ojhb6ftlvjuad2ae8e7fp/zumavigema.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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 18944 bytes
SHA-256: 83d640899198fb9bce3112b871471efd040280595793b0c3ecfb94137a0c727e
font_01_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 10464 bytes
SHA-256: 02a83df609ca72c299fc962d421d3775a55155d51710f30026c60012c00ef434
font_02_sfnt_off0001274f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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