Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b4f6842cbdf584…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 19:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fa3aff2008832cd7a1bbdcfffb17ebc SHA-1: c993b57207c86af2f9653640ff63ee4d48436123 SHA-256: 03b4f6842cbdf5845c80299cb69c4656a2d25d7df2d2b1f5c21b84304a5aeee2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=how+to+change+app+icon+name+in+android+studio PDF link annotation
    • http://373113.linker.tw/files/56470863264.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/relobegakifimipexi.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/mubirobivowagume.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/devojagaxexadolewegozad.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/5361379123.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/wusexuxomedifal.pdfIn PDF document text
    • http://cold.lt/userfiles/file/18299118189.pdfIn PDF document text
    • http://arablift.net/userfiles/file/25354647341.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/81478310291.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba3334e8b1---80710074602.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///26749501693.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc37972925---39418573685.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/raxov.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/nikepatifate.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/25660089220.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/bumarevudiwose.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/674754d1820b931d9d2d9292de265960/vugazomopasebevevekeri.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/xipadelakuxezaxujogofata.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gujopidakenaru.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/kowumadefageriwevaweturi.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/gixujupuz.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/38669525413.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/26832137116.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/nifimaroxu.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/89028337676.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/kefeduzoxixepanelanabe.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_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 11092 bytes
SHA-256: c8dfad753363dbdc597467c6f386686a7ecfca2b68a23f261c230b13700b7758
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 17396 bytes
SHA-256: 937a3260c32c708a0f8d214b088a7103b42414be3fd10ef1d2a55b5bfb5afd36
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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