Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f445236fdc4fd43…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 12:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a390e662d89e6820613be2718ba55d78 SHA-1: 7c479e921f17022894e43190832258aa01da740f SHA-256: 4f445236fdc4fd43ea0f3e3b49b88639c9acbccbb62c2021b93313400c794bc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into phishing or malware downloads. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/werozisexufedatuvorexem.pdf In PDF document text
    • http://radecznica.pl/userfiles/file/29652523035.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/xewiw.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c0bg6p4efnefa79sbbhr7b02sh/kuteponolagupobukekisob.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/xotufosugev.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/rakigegu.pdfIn PDF document text
    • http://upakuika.com/img/file/55795110749.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5vnrmst9928ijnqqr0jbiv46ec/butijegikadopilu.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labobi.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/nuboxaziralidokok.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/27766757807.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0ead5a0feb0f1ad40149cfd3518f2d25/koduxabiruduvojototexat.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/nukiv.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/97506797747.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/vubokafawaxeradapevaw.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/sinomejibewu.pdfIn PDF document text
    • http://villkasz.hu/editor_up/genogewujud.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/jadomoluken.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/53038605398.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/14531337155.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/futuvugikedugis.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e40634d1---67165351407.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/77921834415.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ifb87jgqo7834ck5ahejl7asdf/64321320578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+pe+security+camera+mod+downloadPDF 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_off0000ba2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2A 11076 bytes
SHA-256: 5d1e5337ac5d46e269cbaad3f411ef2983c1a905c673a7849273649bbeb1d3d2
font_01_sfnt_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 19232 bytes
SHA-256: 2e7dd5072cc6281b957a9dc4b3d7ef33da169311a1b835c26e1004d0a12b3897
font_02_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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