Malicious PDF — malware analysis report

Static analysis result for SHA-256 e628c8cd591b36d4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 03:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4e62fc292bbdf052bbc49c747d3a17b SHA-1: ef24021809cd5cb229921fe2d889b61dcfa013e5 SHA-256: e628c8cd591b36d4ff6f36b20009573c3ed66b9857e2f639add6a58a4a53100e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs pointing to compromised CMS uploads and 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 leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=inequities+in+health+pdf PDF link annotation
    • https://soudurelausiere.ca/upload/editor/file/fatewesefil.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/mazijamutuvubatamuvimusal.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ed967e07ebaf8590a7f06682d9c3ffc4/kuxeligulonoj.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/73599870928.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/zinofefepenom.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c33f48dc21fe36f12ed1adb85e29620d/suragikoxem.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/zugaf.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/wasuvugebikobavalazigadi.pdfIn PDF document text
    • http://boldogelet.hu/media/53050860431.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/togisifijitugeve.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e31c81e50b---pukubikegotuzebujejubozop.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210725143523.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tgpj0osq0iqq1d0pgp78thgu1s/mizejapukimiwef.pdfIn PDF document text
    • http://honda-vo.com/upload/file/gutilopafesabebamobefobu.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/98718871993.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16106978129bf1---49811681623.pdfIn PDF document text
    • http://intergeored.com/upload/File/beduxisukanan.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/86862563368.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1611009dff2b60---xegunixaxazeven.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0dce00861---15060728405.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4f86f66e6d9cf94ce0d5a7cd928a6c9e/wowop.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/mevusosisuxolopasode.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_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 17868 bytes
SHA-256: 8e321385cbec26b0d8f742a964f483c685130881c9233ba596a5c64e82d2e0b2
font_01_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C58 10572 bytes
SHA-256: 377af1748576fd7df0a5b3b41c81c948c42e82eccf6e121d1b5f86796963f840

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