Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f8ab04bb6bcdbb…

MALICIOUS

PDF

91.7 KB Created: 2021-07-21 18:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32cffac397bdb2ee440a8604daab15dd SHA-1: 469448a74e38d127677188365d95f72c23fe906c SHA-256: f0f8ab04bb6bcdbb093dc7135a28d332abe5e0a2695f92c4ea7392c2e8039408
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, numerous URLs were extracted, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely used as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://camionespanamericana.com/userfiles/file/safewajatuxegula.pdf In PDF document text
    • http://vetranhtuong.info/luutru/files/vibidapilejofibu.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/lnh0t4g7jladiejd5106l5u6ds/12373644522.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071980c9166d---netudirimalibag.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ee9526287f64f61f0949aa49daff3428/91248284026.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/84dd5ee2c6ada89322c7f8902bdadf05/59003959841.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff608eca07---78994212588.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/menufapesuzolupakuwu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/b49dd7cb4ef8f912dbd06fdeea44c455/83549722775.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/jazoxifegopisaletoxered.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/iv1v9rbamg97m3agrdjtuldmmr/gexolaxebewi.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/30205608039.pdfIn PDF document text
    • http://kalikraft.com/images/file/vuferopiveropuferelasud.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78b1f848ede3efb90025f7051481d251/surinugezebib.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088869d9899f---87439860074.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/kosojujasegepuboxupan.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016792d9b1---56741924650.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/zapiposegakanunetuzumudi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9051a686b---povenezugopinu.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210609044636.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/finidewidenavu.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/98004665339.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd84c1b2a3---40369078264.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1720f2326c---75464825272.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/fakujitib.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/davifetopunalupamaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=esl+feelings+and+emotions+lesson+plansPDF 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_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 17116 bytes
SHA-256: 90fe97a93c88d84312481d95e8fe0c19639459d1b6bc5ccc51a5c41bee3d6070
font_01_sfnt_off00013104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001491b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491B 10724 bytes
SHA-256: fb1b65d43f6b89c96873f14c9c3e472e6e75ad3cc1f156e277e7b3d665540cef

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