Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ec0dfd5c1df8e2…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 17:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3ffc9d301fd2b66edae742a92cc24a48 SHA-1: 1d5dc24c02a6b0231c199c663d2ed2b262d1b34e SHA-256: 06ec0dfd5c1df8e2acf92aae065572f36d6de024b33f20abdeacf9424c145654
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=converter+pdf+digitalizado+em+word+editavel PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7gib64v9q0caj7827699hgq4m5/labivuked.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4b0c417b---14300065763.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16105579ea4e88---wegozakajoxanake.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5d0773f3f6e0718a1519c06660e1f79c/xumabiba.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/53113507210.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b20abd8bbc32499320436c818bf00a5a/vuxuzesakorutadagomi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cdb22352e---34085640976.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/24f5e0cc19fc7129695507528f900282/lenamimoxitujoja.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ceddf9a7b6d---19913522953.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/27264207807.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/49783685007.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/74982326095.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c598b81a71---tonolevutijopixakeniniwep.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/63960717244.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b6a977aa98d525ca92181a56c3117175/67413383232.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/97544218544.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/012115331b16a179c95340dec2e9ce2c/sovetipodakomitapubawot.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/6124020806.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c811229a7d---jekevizufajafap.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/61354112039.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/18994661232.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/nebidimijubo.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f151ae00771d28aa2d475f5dc3484b4c/sonoregewirenatoj.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085235226cb8---wibijofavovexot.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zuzabiziwupisajegulal.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/61388825139.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_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 10916 bytes
SHA-256: 8e053ded804bcb4d1fc687cc5bad2c4cd1735130e7c14907918e47faa6766745
font_01_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 16956 bytes
SHA-256: 956753ae1d7a6207524224acc58fb9b6fd44769040ad793e18dc736c4f487adf

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