Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13f97ce3cc81fee…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 13:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9467cd0b73a194cefc1c6a388546c61f SHA-1: 003270f28b66bfae92c21653cea61b10c530e7f4 SHA-256: e13f97ce3cc81fee653cbaa0d1411192148f13f4e5aa1f93135d1b39b417da8e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=wifi+cracko+apk+free+download PDF link annotation
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3l8hscgda7ikh6l9e4erpqu7s4/52578879903.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/kijidutakifuvotanunimusi.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/44602693667.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nimek.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/zukininibodexomadegaguxip.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/rexifesisi.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/53844730269.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/32074088243.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/wudugiwikirotixoba.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/zepojexekelusikilopuwoxul.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/tunasofuseximed.pdfIn PDF document text
    • https://33mobility.net/uploads/files/20395719548.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c74f9bb086---jepovifogikevos.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396d2f1c8fa---1135436773.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86ba2f2de---10645575663.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/43784357423.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/33554122204.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/53636585488.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/zumup.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/bubifa.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/75756368035.pdfIn PDF document text
    • http://dr-temt.ru/images/file/28124696928.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/rafujibupafusev.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/gaveda.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/k9irbh3l57g8hfgtjlfs1l0sb5/nikuxonebosoranabu.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_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 10520 bytes
SHA-256: 381c3a041e77cca05e2a59d2e30592c32f6804601640eaa5013caa5752d238b4
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 17996 bytes
SHA-256: ca695e2fd9e6f39c8326ff0225fc14395ded40edd47c5787d30cd031ce7df8fb
font_02_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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