Malicious PDF — malware analysis report

Static analysis result for SHA-256 5790e251ded36a2a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 01:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b07c78c7d142613c9b0352fd6bb92b74 SHA-1: 696deb3990b4c1b31f0931b8a6becda1613629ed SHA-256: 5790e251ded36a2a87fc09c7f03dbdb7c9ab8b87e9b3427149a6154a3ae5fdd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or appear disposable, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tksvolga.ru/userfiles/file/6369801674.pdf In PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/ziledomowivedepugoloxu.pdfIn PDF document text
    • https://cmoretv.com/userfiles/6318167007.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/49952552482.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/nulokopizowefad.pdfIn PDF document text
    • http://debten.net/UserFiles/File/59047479526.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109130547571286.pdfIn PDF document text
    • http://jonme.net/ckupload/files/73078349169.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/dedetojitezu.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/xudigezuteletiruzojalovu.pdfIn PDF document text
    • https://harom.ro/files/file/22170825868.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/fsh1rtceubtm340448u6pq7t87/samubugesutoboduzisal.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5da2i1hc1g9prqn3drab9nhvva/kawude.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/50097815498.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/65591544682.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613006548905d---3165705305.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/60688234723.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/xavifepoladad.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/fizaxujadeduxom.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c0703d6c---nutuwitujidugabusasifol.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/fojanumapis.pdfIn PDF document text
    • http://www.pvvc.cz/files/xezazejumi.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/zisutelenaripepilemetiv.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/48783823218.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/kibebafuveter.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/gakolokode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chrome+history+search+select+allPDF 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_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 10536 bytes
SHA-256: 370a9078b9f0680f9bf6ca15f373a2760a9a027bf98174d4b036c2a3fd56476b
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 17200 bytes
SHA-256: 4ce72d77b39b03e081ce80f5c621aae453cf85bb0b5faa4debd5691934b246bd
font_02_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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