Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b14db17f0a66fa4…

MALICIOUS

PDF

84.2 KB Created: 2021-07-16 21:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae1cf707acd4723ef120714c8daf9eb6 SHA-1: b405f704a92a38cb43d994f3bba6c29d8eb7e8bc SHA-256: 9b14db17f0a66fa413a1b6bf6e5d9a9ad0bdcb14d1a3ffb2127031f9fad464bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a broader pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/550d2c3c51e7f4a85a9cd28b9aeb3f4e/wuviwekesanafirafujes.pdf In PDF document text
    • https://vestol.bg/files/file/81806326544.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/37856529835.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/5s0lou75atjdnhk278biht7vj6/kurapubuti.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/sukawisumil.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719091dd217---dakeguf.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/naseligofidasaw.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/miliwivodevopi.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/60915161183.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/10411527600.pdfIn PDF document text
    • https://unosms.us/userfiles/file/lenifamifunimodax.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/s9677ve50l5u0j2tue3vq464t8/64052026109.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/urqksbcsfbacl41argun8tmak0/bajadeb.pdfIn PDF document text
    • http://idroter.org/userfiles/files/67682830545.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3076139d---44668816741.pdfIn PDF document text
    • http://stromzeleny.cz/file/sokarulijalum.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a908644b248---mukuz.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1v2ohvbfr27cu34uqgophhf87b/pezejededunov.pdfIn PDF document text
    • http://billsky.ee/files/file/8033969427.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/zisezumexejotadapik.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb566382fd---62650983456.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c205ea65b---40365424320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=control+systems+robotics+and+automation+pdfPDF 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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 16768 bytes
SHA-256: 2f812f80e17db8fe574f95369ccddb037d9ca0c52f314c1ca9b870262842517f
font_01_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 11168 bytes
SHA-256: 25f4288e31fd033c624e98b4d636146c526b1e4751703f54564f1e169915036f
font_02_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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