Malicious PDF — malware analysis report

Static analysis result for SHA-256 775bd9f93d8ae458…

MALICIOUS

PDF

88.3 KB Created: 2021-07-18 16:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 271a75ec282408f7f9fba56d2b29cd80 SHA-1: 495907539ca84569bfed4a998f2bb1d59e59770b SHA-256: 775bd9f93d8ae458a2b3cf3810ac4daf016668d32eaaa803222290d59e0da805
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, do not contain exploitable content directly within the PDF itself, but rather serve as redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/budanezeziri.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a26eb8a377a973ad113aabe279580f60/senatoviwusizipoxozamoruz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088579db6bc8---76909975306.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96017eede1---berewatiragalemuloxetu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/cn870skho5pmq20snomp61dkh3/15254448541.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/63ab07eeedb78d5bf4c31e08881b14e5/51025553311.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/07c4aa631b233524f66a050e43bb2f8e/77018517798.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/8797856491.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/jegafuzim.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fbe8076829b85bf40623f505791e0c4c/ganakulofeduputixi.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/67c406cb750270534beaf99a11c81310/55659820485.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23fd67957---dimefujo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090a93a2c5c5---73346551068.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb280d9ca7---73118518512.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a9d12d77---30796441314.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/12891635859.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ef1d0201c1f0494e90ff1111ef8b14aa/53370674270.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8b1bee33bbc36a8db01590e7bc8aedf5/20705183258.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9e6e72d65f4de5aefe20e60a880b21bb/komugokujofe.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/55203879262.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vewifefut.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/miranuxavilukuju.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/930d9eabacb781e873acedb269298d3a/farejuxoxogu.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/537feefad7f2b5ba8e875112d8c2e447/95622986538.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/memesokiwini.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/dokojodulagukap.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/fipamerilonolebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=blowing+her+back+meaningPDF 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_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 16616 bytes
SHA-256: 3eed3e6856915399e71deef2b686ba090201d239967824a270642f5c90b1d95f
font_02_sfnt_off000139a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 10780 bytes
SHA-256: 62a1031e65d77cd096b527c5e7fbf759a2bf7f13e926aa1a0d4a742566351329

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