Malicious PDF — malware analysis report

Static analysis result for SHA-256 9025ae6214e5594b…

MALICIOUS

PDF

72.7 KB Created: 2021-10-03 08:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 539672542e7bd60037ba8b45e0eedf4b SHA-1: b7455ab851d3c6a19ea7d1cb7195679a6611a0f4 SHA-256: 9025ae6214e5594b89d9d234df51f4f534bce96237f9a9567e59981a943c5481
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://vinag7furniture.com/app/webroot/files/editor_upload/files/22602692287.pdf In PDF document text
    • https://silverbirdmarketing.com/pages/images/file/jewitixijefavoveg.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuvepaje.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/almrfnik4qr686141ct9uei7f2/sejigekilevar.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/93597530255.pdfIn PDF document text
    • https://12tiga.com/contents/files/betekalud.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109290730161633.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/kugawo.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/kosimimem.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/87321134816.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f760ca9caf---kavoborasuvibazuna.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/verofaxufesenewutaba.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/10899110192.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/62146445351.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/77978105374.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e244e6ac422f564247f1ca70199bc69e/raxovox.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/3151407486.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/gejematotafuzolegoradonad.pdfIn PDF document text
    • https://aneri12.eu/res/file/xijuvokiziza.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/xadijogiwibebesutegidafar.pdfIn PDF document text
    • https://kawanmto.com/contents/files/dagokuruxez.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/14922442024.pdfIn PDF document text
    • https://unaizahic.com/Files/files/timuvavijadibidojenud.pdfIn PDF document text
    • http://seed-hongkong.com/uploads/file/34696987399.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/58511369368.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6a26107116e8baab5284435ef4c90140/bagepuwavevitazubed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+5+download+on+android+freePDF 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_off0000b786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 10436 bytes
SHA-256: 599ec8ec6cb36e87e617f1e6161df3c5c0627730566d806eb7338fee2dc0aa7b
font_02_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 17724 bytes
SHA-256: 329754d8c8980413c49de410b84da7b3fdb5f747ea7960e7d7044bd49cdc7a42

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