Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddf25ff65e8c11d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 10:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9d44c499e0ecee810bc78d527bd22848 SHA-1: 8975d40714b7abff025f3f3a6a6e10ab491e4814 SHA-256: 3ddf25ff65e8c11df8d11defe0f2b5f37d72952685c1781fb01336b354856063
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links, likely for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=the+bachelor+season+19+watch+online PDF link annotation
    • http://teraval.cz/res/file/mabuvotimevutitolulutono.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/mupimefixiwif.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/65233648365.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137554e615da---rofix.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/powapigogafutarukawedibaz.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/putigasetetuxogideba.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/13987835843.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a58b67fe---jiluwigezazisiluzavenisog.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/ramosilodijaje.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/23393038046.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3a257d09---fajozunerop.pdfIn PDF document text
    • https://protum.se/file/nasojikoketawiwa.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/mumisiwij.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/13907630590.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/80201117410.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/33654682294.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/6814531196.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/13618143176.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/28137260134.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/xurizokadaz.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea61c2cb66---tofupejopex.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/fogamowepubifuni.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/nidemoxagejebokororeni.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d7547203---pivuverun.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/96069305970.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 18224 bytes
SHA-256: 0c1a9f3d217199c03475757667586cbd5ecca50e74df1fae8f27894db00e600e
font_01_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 10736 bytes
SHA-256: 27a315705a81b0e1cf7aad18d35d23e35ef14739cb3c16015b5837f0f394abb8

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