Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a4342411583889…

MALICIOUS

PDF

86.3 KB Created: 2021-07-07 22:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 659b36e779ac1879b3bd7960312cd66d SHA-1: ee02e8715745c8462315b0a621019c1fb0caa2a5 SHA-256: 10a434241158388979e58dc4d77b2c091b4db76c8a80ad7305a37c5bec44e536
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The presence of multiple links to potentially malicious PDFs suggests a distribution mechanism for further malware or phishing content.

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://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/46279dc3d123ee208a52edfe05bfb673/juwodiniratotenovasufo.pdf In PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/46909019741.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/dogoxunifasezaz.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kizejowovew.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d0da8506eb3c51e0c26888fa1ecfabe4/lopepo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee11cdbff---43638613967.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/kulorisobuzokume.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/figelifuwowazik.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/15348293979.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/58939043484.pdfIn PDF document text
    • http://charontrade.hu/data/file/14999337948.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/60675669210.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/losupitabibezewasolipi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608754d968736---96370669370.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c718c44b238---25981255576.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b2825cad63a---9906330369.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afff782d324---folufok.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc95d256fe---89233977374.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a04d0761---12628243403.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/ladazuk.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b3a84ecd6---bizelijis.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2182cd1ff9---6135212285.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a622f88a2a64eacf874d2bbd4e21703d/rugatojidamuw.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/21553648865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+special+product+of+polynomialsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 16196 bytes
SHA-256: 462a4783e98b38620ac8f8ecdcd5a68537a1a8a2bd0fe099007260b825b6a7dd
font_01_sfnt_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 18600 bytes
SHA-256: ee6d20b93a3785487360a8a8629d645e8dbda190ce6756d6d27bd11b99a1f13e
font_03_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 11092 bytes
SHA-256: 2ed2074ad3095e87be8176032eafd55678af569d16949dd3d02ea7c7e36cd49a

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