Malicious PDF — malware analysis report

Static analysis result for SHA-256 691f301ad7225b78…

MALICIOUS

PDF

98.8 KB Created: 2021-06-27 10:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7e4802a5a82fc9302706325e3cd308c1 SHA-1: 586a4d22205c14f05f304f9d66d5136406a7ab9c SHA-256: 691f301ad7225b78a9d67e0ae1e78791f093fa9038f639cfc059b8c385cf8f88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. No scripts were extracted, but the presence of external links suggests the document's purpose is to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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 http://muacuoi.vn/Pictures/files/resipotorojiropesudefov.pdf In PDF document text
    • http://amadpich.com/userfiles/file/43473352113.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e113d6cd7b---furotisuzad.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f9eab8eb---wilanefipomudukoz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a508618e32e---69352838915.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/c6ee3fcad93e9078274dce9545d4b45c/29713627594.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/naninakanifasab.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9d4664fa3c80dd314f0097d631ec7f38/5868115466.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/74638180127.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052516173919.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ae54f9314d95ef50cdce693a13d7bb57/xamusagufarodofodiwoloren.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/mixukur.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/5co94km52de8cdd0lbuvh0fpnu/39238766275.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/p7lrkt2ofut6mro2qcko509soq/rikajejitani.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/58438972697.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/difusisarugusukirela.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/upi9o7cb8a912n8cii690irdir/76729250088.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd897ac57---70855392582.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/govuvedok.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6312697ab0---vufirexo.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210530_5A9798E573C0D966.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/99399230773.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9439555ce---gaganuwanofunuxoxuguj.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608695189130e---37110304388.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16073371e12fbf---85049807807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chat+de+roleplayPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 16288 bytes
SHA-256: 6a23ee11e4ab1df55720d2a6c5441ed740f5fd05d8d8d1ec7b2e35e9d363f7ff
font_02_sfnt_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 17656 bytes
SHA-256: 851c4cf193a3f444c8a028ded4f1bddaf7fa96ce7089b6114f851ca85ccc2456
font_03_sfnt_off00015dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC8 1696 bytes
SHA-256: 0a4f45ca35490f1796084ea6d97ca1a4a36387197472668db154df97085ea45b
font_04_sfnt_off000165e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E3 10268 bytes
SHA-256: 8cdf29b72972de4a11a771707f455c99197fd9f431a374bb7a4ecb4e9005be71

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