Malicious PDF — malware analysis report

Static analysis result for SHA-256 413177a805de12d4…

MALICIOUS

PDF

88.9 KB Created: 2021-07-01 13:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9ce0bfed81683cc5dd4e30b04ea85355 SHA-1: 0527fb55f24ecc6db6293618837bac5869401f74 SHA-256: 413177a805de12d40499928a85309eb9918f02cb31dba14f3d95bd0a81709fea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common technique for phishing or distributing malware. Heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=red+english+staffy PDF link annotation
    • https://mkontakt.pl/dat//file/kakixujekefabugile.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/18ddf1996ac242469df8c18c8087b1b8/vowaliveboporobed.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071d34e7015d---48232404455.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/77869735657.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765d251bd40---jenixiwazasosalebakalisuw.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf214f0152---kejulasorobumelutuvepi.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fa9260ccd09021a6fad2c54430154132/ninafadevu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2803a5a95---mudakozas.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d9f3d0e74b16fec56b3a9479f2097fd/45822563701.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056efbebeb---57111684697.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc3d35074---tuwolizisalifudeles.pdfIn PDF document text
    • https://actor-conseil.com/files/file/wupimaz.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfbec8c8b7---gaxoxon.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6f250398f5ac46fe77c4fcb8034ef309/85557183867.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/83954126331.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/2892163562.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/revurefivafonegekomo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f59538060b8d9f3ab1ebe61ee0dd1abd/kisujadapavokebolixuve.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/74101492386.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4c2bd1e1870aa537bd1222944c30a823/56387358009.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/guvax.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7abb47231---95440678133.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7c40ead0d0b52027952428b710583e3e/45966942963.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/sonawunar.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0587c30289---tenazewetixalunib.pdfIn PDF document text
    • https://www.alamy.com/licenses-and-In 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 16516 bytes
SHA-256: f084af858d8d7060a9929eafc023618fb0aeab2571fc64931cd63adf753342ec
font_01_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E93 10572 bytes
SHA-256: f6bbef8c90f7b6d74b149b663401d4768ef9da8aeb12988cd1fdfce70706a52a

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