Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef5f88ceb77d902…

MALICIOUS

PDF

103.3 KB Created: 2021-07-25 15:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4d635b389f0516711cf417dfb2ad4fd7 SHA-1: f0393c7472570d2d2d60114630388084d2a14527 SHA-256: 3ef5f88ceb77d902dc7aefe39c22eda836c507a71b5beefe231172850677cb14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://vendsol.com/userfiles/file/foredadofijixodikum.pdf In PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e62332dfb58fd63e86dc134a6d08136c/nuzezalifot.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/sazojimiboteri.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6e2buidmouffg9la6kcvtr0bod/voposeruvoxiwogirusit.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7192fed545---jadak.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1a0313eee1aeaa09180ad7c5354df174/10358568427.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce68b85706---45598606696.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9fd23d6d---84752486787.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/13211344226.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845c0540a8---lizafosomijikujuvi.pdfIn PDF document text
    • http://feg.vn/uploads/files/netodukokuvobigojov.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/dibugeparosobupoketirowam.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/th97s8rvhh9jum54uabagigo56/zokisewaduzoduvozamame.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095553550501---mexapup.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4739ba0dbe---4766531299.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/73fff2c64ee9b2d2a36535e4cebe621e/33726185994.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1af80dabbf5a3a17c6783d2e2a1e6ca9/67281387241.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/17608103476.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd46258128---33534776882.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/vumonutimibixejidib.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/puvoxiwi.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f10d0a706f0f65bce62c238ce20aea33/filegizikigezegudad.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073608fd5349---12737904337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=reglas+para+acentuar+las+palabras+agudas+graves+esdrujulas+y+sobreesdrujulasPDF 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_off000129a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BE 11192 bytes
SHA-256: 89694d013c35558f296d37b488ebe26b889982c49c3d4d9d2e4256d35b28c701
font_02_sfnt_off00015bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBE 20136 bytes
SHA-256: f6d12edc978d1ce21e062cf3e3905e5778e2fecf3119c27d85ccca2faddf06ac

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