Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bd02eed2284810…

MALICIOUS

PDF

88.2 KB Created: 2021-06-15 19:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fdcab18ecabfd897df5ec4dede0a8772 SHA-1: 10ef6f1d14a4efa6fd8f3311a1137b320e2c20a8 SHA-256: 99bd02eed2284810f744ab365ab4b06592d132934d62280542eace7ddf11a78c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to 'Alabama DMV study guide', aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/uplcv?utm_term=alabama+dmv+study+guide PDF link annotation
    • http://euroinstytut.pl/galeria/file/jutisididexulan.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/10988094644.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/gelujirulipawotogumavegi.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/16364950196.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21d66aedf---giputowuvuluw.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/kunukuninogesorugafatane.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725a50ac299---85422888936.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a227da2e6e8---xapofizolidijoromuwodige.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/jizovisize.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c32982a80c4---38235094545.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27163d781---sapagidasuxafavud.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde8bc6e7f7---25357683507.pdfIn PDF document text
    • https://langumeistras.lt/i/File/55364288972.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wibisumokajitulobedas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 5340 bytes
SHA-256: b11a7f2815acfacb6d3b66d3dbf2ee5e28d1d9a40c5ae911583c39dd4e4ac91f
font_01_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 17544 bytes
SHA-256: eb46d3d56dba7488929dbca4c236c3b123dbb9ab7061591c96c1753b7af4c5e2

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