Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e2ac074f755766…

MALICIOUS

PDF

99.8 KB Created: 2021-06-30 17:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9913a9f9fa48502b4f3ac946e837c103 SHA-1: 7a78532ec006e8345aee9ee2f6dc566ae4e5238a SHA-256: 08e2ac074f7557664b161d9bb615aa72dec5cadcced13c2ac0762325e865b6de
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 compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://amctop.com/board_data/editor_img/file/202105120952.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02695e53c---tanefapudozakesetoretirer.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/481464033.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6e6usdmui09bj4h4h54umm0ccf/37688365575.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/42258eb99217f27068e9eba881427d4c/93784706055.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bde461a6---42155177750.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sokezefozure.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vohg6b0olcjpcb5v94vjrgsf7k/1776910625.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/pugeja.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28961fff7---palipevuwelozorizinu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6491c39d---87997506525.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2e648daf3---74596759658.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/pedagifuwomozaje.pdfIn PDF document text
    • http://teraval.cz/res/file/kuwebalarigi.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/desalateriviwixu.pdfIn PDF document text
    • http://bakoca.hu/files/file/28363899560.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/47868675291.pdfIn PDF document text
    • http://superpart.com/files/wufilekukidinag.pdfIn PDF document text
    • http://omni-links.com/58915380420.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/kivifotusowubivemowanowad.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9735d92ea3---27252987596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=software+quality+assurance+notes+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_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 11136 bytes
SHA-256: 8b4d781c4ca6077a065528744f2b5bf3291c642ec7376d492c700b56ba99a76b
font_02_sfnt_off000153a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A2 17752 bytes
SHA-256: e2f88f7cb6efbb2ebdbfce6a9d82268f5ebee5ec89b044b93414154f2d328c65

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