Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f4cb2c6287d3bd…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 09:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68b379cad2cc776a637c7a4fb0fd0d67 SHA-1: 6efab7efb66bf2d5838259822a41fad841773d4a SHA-256: 86f4cb2c6287d3bd1afe17ffbb3ab641d7697fd3aec7714f001c723b46736f81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the true destination or host malicious content. The presence of embedded JavaScript and external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=ultimate+ninja+heroes+impact PDF link annotation
    • https://fpcofmacon.com/nbloom/fckuploads/file/51980104552.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f3bf1b872b70dbd5c8f3de1a6610f2be/6570937684.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/11957578563.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495237c951c---31630679820.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/sikodoxumileja.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/45242227561.pdfIn PDF document text
    • http://rld-carbon.com/file/ganeral.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/96831776782.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/gufefupapilebelixi.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210906060247.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/juvomiwagif.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/56582353193.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/59657737712.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/14903756994.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614741220ca95---7967463802.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/kenisibiti.pdfIn PDF document text
    • http://esistore.be/userfiles/file/13106350538.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/77192021183.pdfIn PDF document text
    • https://thebottombillion.com/business_school/uploads/file/sivuwinedosumimiv.pdfIn PDF document text
    • http://apothepharma.com/upload/files/96391516225.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_off0000ae27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 16424 bytes
SHA-256: 57dc036143882c8f695f932adf4ef41dc6720c4fa053348878aa7aca77ba250e
font_02_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 10776 bytes
SHA-256: b7df7464e44429eed01d9bc96b548da32e5ae3d335d9a9d571ad6f7745427f89