Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d88b5554d4fd8f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 15:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a72e1d32052eac11b8b59840f584cd7 SHA-1: 19c67924f706b911068900fc1afbe73d406d000a SHA-256: e1d88b5554d4fd8f5d0bf54f0554321d64ecea5ab5d64559ca2156aa90199be1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=gst+galti+sirf+tumhari+movie PDF link annotation
    • https://appchecar.com/ckfinder/userfiles/files/75911453282.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/nagelokelugutepu.pdfIn PDF document text
    • https://europartner2.pl/uploads/kilapolilogipugabuwo.pdfIn PDF document text
    • https://iword.de/userfiles/file/puvowuvegijukubixupufiva.pdfIn PDF document text
    • https://harom.ro/files/file/59700055241.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/strg6b6u7roi21fhuktrft94q2/68885673423.pdfIn PDF document text
    • http://reylab.com/userfiles/file/53002377315.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/qpsq4mbbd1975cdj6bu3geq6au/vopovine.pdfIn PDF document text
    • http://wdnederland.nl/file/fetosijomodunatilug.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/kukomizuda.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f788f21aea---fepaxosakes.pdfIn PDF document text
    • http://trevorhannant.com/zevezisowefu.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/dajetopag.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/bulidakawozuvejames.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba2175ae8---13684476575.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/zofopekonerasira.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/22790068122.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8c92c51b---84622102163.pdfIn PDF document text
    • https://haidangpc.com/contents/files/85611508905.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140773de2859---35855200717.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/lerowemexos.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/59189557274.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/51889866070.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/rexige.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138873481efd---34161364291.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_off0000bf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF10 17520 bytes
SHA-256: bef17b3853bb44b66b58ab9b1848e1207eea3c743f290e6193e22250d0046dae
font_01_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 10760 bytes
SHA-256: a73474e4144985f9266f9b900c628b40aff0bf9b3bf0cf16200a6ae7c83b3eeb
font_02_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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