Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06ca933f8020770…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 07:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f78d0b542e8d22c75a6c7db412420d06 SHA-1: e574f3440a3f8de7896108f22d07ff760a6ff11f SHA-256: d06ca933f8020770ebbedb5aae5d7a3ab1b0d581bed30e1ece734ac8e2e60129
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These URLs are structured as a link farm, likely intended to lure users into clicking them. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the nature of the link farm and the detection suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16147e1da26e1e---jodefurila.pdf In PDF document text
    • http://domadoma.cz/userfiles/file/tududaxejowu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161316e424726c---wugedasajefodigusuwulege.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc8234499c---74765191051.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/77757513373.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/supomubageruvotixina.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/sukobesilajutiramopefedop.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210920015153.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/kabajuzeforijalox.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161309512127cb---besekasidexizizuliribuz.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/fotew.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/degurufirijibe.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/60394315906.pdfIn PDF document text
    • http://stl-hk.net/userfiles/bolukub.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210903115656.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/92679567053.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/15995713304.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/jefiwezoxubekatogewenif.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/pakosunoxu.pdfIn PDF document text
    • https://anup.bo/images/files/regonepidededizejirus.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/rijukevutunulo.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/68524818400.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/58d934eadd109682583822967698a6d2/vebepowumagaxuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cinema+paradiso+full+movie+with+english+subtitlesPDF 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_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 11368 bytes
SHA-256: 0293b762ff810366e115178a53f912603350138044cc0d5ec1644441a90f4d94
font_01_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 18064 bytes
SHA-256: 11f7742dc247be558d36dd302d5017ba22f739d2c2a296c5fbb7c555842d2826
font_02_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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