Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f9f150ed070338…

MALICIOUS

PDF

137.9 KB Created: 2021-06-29 16:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d39ad9ba6e1985fc9996d20fc7f0dcd3 SHA-1: 9ba862134d59430c37a5f4595c03a004dd54c0b7 SHA-256: 00f9f150ed0703381e934447b373a8f37d65b5a34aa6efa4c79587f25585a1b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other suspicious domains, indicating a link farm designed to lead users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd930419e---losome.pdf In PDF document text
    • http://bmsorganica.com/userfiles/file/35829716129.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d3acc2338cf6ae1121aa2d222055690/14079792094.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab33319da3---ketew.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1cdcacf80f77b2eebec6034edb8111f8/wopinekaxobes.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4ac129812---subudijak.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba31fe6842d---ranonufinanewi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/vtg4ttndgehip1pm72urs27222/tifopukev.pdfIn PDF document text
    • http://www.bash.cl/media/file/wefinelibuf.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb18cadf7a---60681352555.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca146a103c2---19578234367.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f97afcdc101836ed711ff5bab955ab61/19865966117.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609424cabd972---kavonepe.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad37df160ab---55006436924.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zunasuximi.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/fuxikanezegivigejux.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/16063176850.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/rutuxejewe.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/vosezalitugizutu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ht04ccl9surjb7go4nrr180bd2/47310165157.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/zivasomebi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608091e6aa727---dotidebun.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5080d9fb2b---59151511196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=computer+architecture+a+quantitative+approach+5th+edition+solutions+manualPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0CC 11256 bytes
SHA-256: 9c0cb870fa68a4ed086a35a5dc123a77a5ecb52d3846b571a2dd3b6021dbedfb
font_01_sfnt_off0001cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CADB 20084 bytes
SHA-256: d31127433eefc23f7365453e4a8c6b61711ea2906e11ad0722ed8fff57172da3
font_02_sfnt_off000200ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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