Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57e982b40f681a6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-28 09:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1713705f18f9611d667cbc157a8628c5 SHA-1: b566036125b9a6b61f0dd9c933f8c12474078c7f SHA-256: d57e982b40f681a6f9db43aa196993d2adeefacf055af30155094aac2628c20e
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, and are disguised as download links for popular software. The ML classifier and ClamAV strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=minicraft+download+apk PDF link annotation
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/7577923495.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/23771881584.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/94391485856.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/zitunedu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/46afabee279f716e6b740ebf7fe54b3c/21697381604.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/59582499605.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465d6b7e83d---bufudafewigotulibanu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/52196270546.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/92f187c2feb46bd9b94f0596b2c77251/85939299791.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/nikaxuselabusifamelaz.pdfIn PDF document text
    • https://bselink.com/userfiles/file/12061960223.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/vimunirigiboguxoxuwajazan.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e419e7ef7f---kasoxipagojuxalu.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/medetuvofe.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/27913646655.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1005258299614ea5748d9be.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210928143036.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/sapijevoliwule.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/71951266741.pdfIn PDF document text
    • http://showdoimovel.com/files/files/xomagefoxomomorodafidor.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60597623544.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/mitum.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/33093546891.pdfIn 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://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_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 21204 bytes
SHA-256: 517778cfd758a8d3cab10df2b306ddf83b66fb695ed87382c85e523b4e63123a
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 10484 bytes
SHA-256: 644061139632d30a89453c174198015e4deab24ff791fe3c197e2c7e90599b19

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