Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9851ba9efdd1f8e…

MALICIOUS

PDF

89.5 KB Created: 2021-08-25 01:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07ce2b981bbda4349baa1dd023ff7374 SHA-1: e46fdeda6ac78411fc4360470ab01e112d0db42e SHA-256: f9851ba9efdd1f8e37eacc34c73fd72ea41be139a528fd77d4a22dde7c655bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting it functions as a link farm. The presence of embedded URLs and the overall structure indicate an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=game+of+survival+apk+mod PDF link annotation
    • https://digireg.org/upload/nedirolesik.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/10f1ef669fe41e9cf3b414960ff09999/dafuf.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d385915f85b47c7de448978668ecf88e/fujisugedesejevititu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/bdee06eb060e73f333c49c25cac08290/nudimabisoj.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/loue69dcmlpanjt9l0s0h4jats/jaxidenasemowekuw.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddac36ac89b---telejadimarukapulufenafex.pdfIn PDF document text
    • https://blogsma.com/files/valizoleva.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/jadeforunabezuloxerad.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3b3522f79172f6834499d6ac8275020/foxewomowixagezemixor.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/21727745065.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/99881685896.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b39bd623c---lisineburadunisijil.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/wekuletuvemujuxa.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/mozelokipoliratuna.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/246369770.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1dc0ed67---dasowirizelerot.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/wifiretavomig.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6aff9193fd4a1e6cd3f2b5482f1c1e13/21535067225.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/xiranupurila.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/fubovaxumafo.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e59c4e8b9258bb0affd74dab2e3a9ef0/jivorotibe.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/22841335508.pdfIn PDF document text
    • https://mmszke.hu/files/file/11697381483.pdfIn PDF document text
    • 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_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16924 bytes
SHA-256: 516f3e7afdb057d4b39240387ad13c3c655a0a4dd0fac7d78c8fc0a902f9b848
font_01_sfnt_off000124b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD0 10752 bytes
SHA-256: 550937c069ff7c419d98c5fcc923a5282e5d5ef242f5bb461fd62f035c31e58c

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