Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f01d55ad01fb104…

MALICIOUS

PDF

85.3 KB Created: 2021-08-19 02:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e572cb0a108ccf9f59d0ddb6628d4580 SHA-1: e24dda2bb23ff47516e5b2818be7ff19200ec826 SHA-256: 3f01d55ad01fb104b278ef4ee6bb0b74b50c6bfbc6eebb6cfccac5e7c738d6b9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically an invoice or payment dispute, as indicated by the 'SE_INVOICE_LURE' and 'SE_CALLBACK_LURE' heuristics. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pixomot.ru/uplcv?utm_term=can+i+renew+my+forklift+licence+online PDF link annotation
    • https://joebalogh.ro/imagini_ws/54548786112.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/6cba4d402cef2bf81348065b8e5f9eef/luworolififowewojetav.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/18264023130.pdfIn PDF document text
    • https://festacontinua.it/public/file/77206172166.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c798da160c---96593426936.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5c0fe5a3e---23761608333.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/solerijemote.pdfIn PDF document text
    • http://byecook.com/ckupload/files/5629982007.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9a1290af---xupasonas.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608503fe8a9c0---77313302477.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ui7k45mmc8lq3vpkrqhsl93dbk/66299053357.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/362cdd0d46843505d355478b7e9fcacb/wapaketisodopujofelob.pdfIn PDF document text
    • https://o-dance.com/upload/files/lufabigumag.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf47d6334---74996619549.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/xisumanuk.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/retunutorewaviv.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/2837738984.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100bbc8ca135---15282777311.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/17072533594.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8f544710b989bead290a8835dbc615a7/27175226119.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91390163251.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/kazepide.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/viwapagorinopir.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/35235720574.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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 18692 bytes
SHA-256: 726b3ec79e0818aa4d328ea15ce526d15504ec71abb4b4ca2a34692ce055013f
font_02_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 10652 bytes
SHA-256: 1e993ba6158caa77474d9632ac7f3d5f79d8f3c8013950bc7c3f783e462db99e

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