Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a67c671a1705848…

MALICIOUS

PDF

83.3 KB Created: 2021-06-09 01:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 11d8ae57108ce931e403e764c3cb5835 SHA-1: 9c58b4474d5c4e5284634487086ca9835a523d1d SHA-256: 5a67c671a170584865d452c4dcd5402e29ee27ef1123d375540506d9828d71dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the overall structure point towards an attempt to deceive users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=11th+tamil+konar+guide+pdf+download+2020 PDF link annotation
    • http://4grd.com/cmsimages/file/jonepezanevisureki.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add362ae404---68810183162.pdfIn PDF document text
    • https://immobilgold.com/file/25044463373.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/subakenumet.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aede42d8f---xeriwerovonababu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5o8bntr63ec4jrrg574buhkl95/65137997879.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48aee473a---zukiposejimizu.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/33476567427.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/25106248327.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/nezojilavobenofazozusor.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/wexudeguzara.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160963a0b53baf---8121545886.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/mijinirogeraralowajab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5664 bytes
SHA-256: b5a82993f75d7c7ae4a9b9e3091c41147bc8168e9ece2d4126aa8bb29d0cb468
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 12724 bytes
SHA-256: 0d142fc7c8d06571f5809d0bac7ad9dbc170af6e3764470430c0a66ab3d7a255
font_02_sfnt_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 10584 bytes
SHA-256: 1d991dcab8ebfcf23d449ece8ca164244b935e4dcfb62115bdfa96a6d144731d

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