Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44f95f4b211952b…

MALICIOUS

PDF

99.6 KB Created: 2021-07-13 08:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 002f97d6281b67af20c65dd11f878fb1 SHA-1: 758b30e315cbe9645106d2bf35d9b90cecb0afd7 SHA-256: a44f95f4b211952bd3ddf3365decca42cea56a370a907286be82db796f6fcd74
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://danies.ru/ckfinder/userfiles/files/23858533810.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a533a1d79ee---kusilomibigajazizap.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7145414865---14712402305.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160874a8d3dcc8---89651379529.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/67020860775.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/32969547053.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070f88618e0f---57532446418.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b234162d---75672170216.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/k9v34qvednve2vvlhilicbpog3/22044990779.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/sasidewubexi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce99e7182c5---fujetobiluzixixap.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2162b97036---kigima.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/99218257612.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vu359bd1tch9p8m3fillfvmt3p/paduzemofemuj.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/23b49b4d4dc00f143862cb51c7532d10/sugegulatufidugoni.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/sejalirajik.pdfIn PDF document text
    • http://k1a.ru/images/files/file/nemojexivujadi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb049ad19f9---93783786081.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429200743377120.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/diwofodom.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jiut1f1d7m4m8t64vb1t9a74s1/76313244202.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/81820327936.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69230ee66---43932508456.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af3d53994---gijetagetiwepopejepano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=set+my+timer+for+7+minutesPDF 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_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAE 10504 bytes
SHA-256: f8a05d8bf251766717e0ecabd3d71e065160b6c7126f3125cab06382d83a8acc
font_02_sfnt_off000155a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A1 16940 bytes
SHA-256: 9514dd58d395dbc0fe638637351bd59baa58ad334b9bd8afb27a95472e4f9566

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