Malicious PDF — malware analysis report

Static analysis result for SHA-256 34513939f45232aa…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 14:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd9ecb7c49b7a1b6971220c7eef86449 SHA-1: 468fadf6c54757eb51ee8611e7cbc26f31cc0c5d SHA-256: 34513939f45232aacb65a3d91cead0ae251acec8c7d805cd01e105677a264085
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories on various websites, suggesting a link farm designed to distribute malicious content. The presence of these links indicates an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://visionbrindes.com/admin/fckeditor/userfiles/file/68030955128.pdf In PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/79232902304.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161121716bbd80---26196093444.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/muvesorolavoridit.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9968c196446e3651806f1a37f03ccd2c/bazope.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kubedoxo.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/58100573795.pdfIn PDF document text
    • http://evola.it/userfiles/files/28542630390.pdfIn PDF document text
    • http://szpk.hu/_user/file/59687391822.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/kujuwifavetovitotewe.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/lifuribimop.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/xopasawisavajon.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/406c2cd3904c7f7ad421476c82d3ccab/29473166897.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/tarogid.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b171d484d72---wevofifusulot.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/52e90231b93c97332a3103203e87f914/varozajasis.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/tolawiz.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1e8f4393791e7d3f7c4477468cd8eb89/53099542683.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4b46a03f8fa719fe38b3eec9be37e57c/72486768788.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/vokuxigemekogu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16094da9b8d1d4---18796027146.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/78962019110.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f7ed45e061c4e071ce0383009882c2c7/tabixolabikekigolumug.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/gowalitogiw.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/35908442172.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/28686851362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2015+santa+fe+sport+user+manualPDF 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_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 17836 bytes
SHA-256: e609500f37a855e451c74c815b41eca4f39427e773ab49872bf4f3474a52b54d
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 10860 bytes
SHA-256: abd9b6aeeeda2914e91c01bd928b9861db335a78488ee74a5fc4a33fec85bad0
font_02_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1