Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0d7462865310e5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 03:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71af947512eb747d18108c2ca5902ccb SHA-1: 8f86c06a7bdfa50cbc6428818d137c3e3d494d87 SHA-256: 3b0d7462865310e5f7d6985ed1ac192c5295103f0f73bdecb4795d7bcf10e80d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=pintura+manualidades+ni%C3%B1os PDF link annotation
    • http://aptwash.com/userData/ebizro_board/file/19071983984.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/27206503418.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/kivez.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b9448fb00---63024050499.pdfIn PDF document text
    • http://aweibel.com/Photo/file/60767756580.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e7333738e---26506421713.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/solikukon.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/tomefix.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e56aa3d8e---devokigaguxude.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c94d5346a57538c747f159a60035fa60/70524027667.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o8coldutoj7smetv6fnag4riri/66884393603.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/82833074022.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2561e17b7---kogatoberezapi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7697961ab---vebasifevafatosuroken.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/86120293634.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/97802973797.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/kawudazedituwiwusep.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/diruzodaleze.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/79751874062.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd89432c6f---jumexilidobosososak.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/96472914073.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/welopuzo.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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 19028 bytes
SHA-256: 52df47e1d48f74fee1b91fb2b065c14244b39c2704ae6ab0c74546fb0b8f91d9
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 10716 bytes
SHA-256: 03d9d9d350ed3de50aaf3fe154ba33a04c14f1b4202a92f1420339be68b5541f

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