Malicious PDF — malware analysis report

Static analysis result for SHA-256 a896e7e6b7060305…

MALICIOUS

PDF

91.3 KB Created: 2021-09-18 00:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a858e5ff83573924042cc4f698e4963 SHA-1: 4d9b8691830f89db5f34fd992db8143cf1701f52 SHA-256: a896e7e6b70603055fb38795e340b6aaab7bc2efa96b6f268cbc3c2f080103a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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=modern+ops+offline PDF link annotation
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35173381285.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/42054674562.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/kizovifanoxenupema.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/35424361851.pdfIn PDF document text
    • http://korytnica.net/data/files/47544484316.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210918/files/20210918052933.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/pidevegos.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/1af4dd5afa7cd7e65c396f34e6f8497e/95357888965.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/jogegiribo.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210912090155.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4fvcr6g2b52q4gt1r2o0hc12m7/27376001266.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161450989ecf94---venurigogeriloja.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/31200225671.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/retujuzulofuremiweter.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/12045804389.pdfIn PDF document text
    • http://unsersohn.ch/images/file/timopabegeledisad.pdfIn PDF document text
    • https://ultralloy.net/upload/files/tizupifofuwurumugegirim.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/silarotewubidawevejupojam.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/47902cb82c8d91b364d215a1c14490ff/rinodonodifeza.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4adc576e---87360086918.pdfIn PDF document text
    • http://4bx.pl/public/file/gupusirepuru.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/39054953425.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/fujukemuwoxopagi.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/84694647010.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/sovotoritezoj.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/9812333869.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/88712421086.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_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 18488 bytes
SHA-256: 3355fb7be5758c5f6635087cb3dac00b485fd61a024e26d3436e436ea4ad593e
font_01_sfnt_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 10224 bytes
SHA-256: 95836024b49bfd326dea18153b6452e1837d4d024d89a258e663fdc458247969
font_02_sfnt_off0001471e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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