Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bd82f2569843b8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 21:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d614b8489d6f8107ed750fe73401e430 SHA-1: fdbeca0be56ddff8a8ecc1ddbf19038277cf589b SHA-256: 56bd82f2569843b8864b5f3b8c01720d4758b38f25705a8849237d4b54c12402
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to PDF files hosted on various domains. Heuristics indicate this is a link farm, potentially for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://underworldgear.com/upload/users/files/72766630664.pdf In PDF document text
    • http://firewheels.pe/userfiles/file/kozarupopaja.pdfIn PDF document text
    • https://cristalensi.com/public/File/96208256856.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9a693a458b317405c6feab099a5af1ea/jemalijetujakaxefatoripaf.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/nuxegopuwizepiki.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210727_221639.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/basapodujiv.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/zeserupu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mhdmugpcgk4dio16fs9pbbkel8/61342932311.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/989fa75da683c4482c99402ee8eef528/kixetamatof.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/xozepumagizusaxesolo.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/nukozofofulutaxetok.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ul9ucs6c3v6hen3grq64krfntl/58257042296.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/53121212374.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/verifobadamik.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/xabevetel.pdfIn PDF document text
    • http://axwelindia.com/uploads/89303678730.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e4cb55e78e00a80e83ec72ae9d077792/35315920830.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1628683018.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/xumedelipep.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087913add5aa---lofefamo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/7623302953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bisquick+blueberry+coffee+cake+sour+creamPDF 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_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 10940 bytes
SHA-256: 1098cfb47c5ac20ce62477f811eb20d647a3ead5ba96c55aab5aed476c633995
font_01_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 19064 bytes
SHA-256: 36c3e22d8414ff0515786aa4d7ce67324e0e69943664aef43de2a074dc74ea5a
font_02_sfnt_off00012b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1