Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aae078b6005e325…

MALICIOUS

PDF

72.5 KB Created: 2021-09-02 03:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96506fe840f7a63c4f83a247282eb512 SHA-1: 5f0033b625197bc4c60414c9d1e34a5d1db13849 SHA-256: 5aae078b6005e325ce7c8fc93ce2692117947c16f28b1ae41f422b0f3123ba58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to WordPress installations that appear to be hosting PDF files, suggesting a link farm designed to redirect users. The presence of these links, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7g10d15g32nd3bj6cu1kakcp5/katosedogipovave.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a980fadfc5d---59648164744.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/bazizufutevizedura.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160767e183d5d3---pekuxuvabuga.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/67879483692.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/7609550311.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857bb8482fa---16761479141.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a94d68aa---34801814704.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/85427826407.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/tiwejajukusawab.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/vizudexeped.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ddd83704---zivugefagunubitejapu.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/lasubapifoli.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/9912268974.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/ratanulivosimigoseduk.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ce87487---begupipe.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1e01a30e4569e85bdf4c147a34ccf63d/2799966620.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/69891232095.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/javikimatanaraka.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0312c7d1c1a6ec55b73d6a2119584c61/76094417632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+effect+did+the+printing+press+have+on+the+renaissancePDF 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_off0000ba83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA83 15676 bytes
SHA-256: be3e2bea2fe62badb31b08f6a4f41c2fd77ea1bdcfd75882ac65897687bf3421
font_01_sfnt_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 10912 bytes
SHA-256: 79ae8df9649a840655ebeadc93bbf58dc61f0e14821239477945115b5b165755

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