Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7f8a79af0356c9…

MALICIOUS

PDF

92.3 KB Created: 2021-07-23 11:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e77c7a868ce894705b833fc437af93cb SHA-1: c9879f3fbd70dbd8986d07f82257cff8ae7bb5df SHA-256: ba7f8a79af0356c9c3f0ad85edbade059073753aa20706d96fe185d97b7b427b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, 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 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e3fde14080dda3791820938988e7f31c/jukomafizilavuxevi.pdf In PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/35070318946.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/85813986446.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb98ba18e---25414869839.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/newesojarobaluxapekatir.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e613bb33c71fcd9ab93b5ad4333a9122/monozerazevejov.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1082b72dd56984267ea1e3a38c3b4734/26742563811.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d930d97f---26353614030.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/zinapi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b290ed24d9---duvubirapogizipuk.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c185b09fe14---23772914704.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/29f5c7865c5ac50ac63bae257a94c5c4/mazofuladikowege.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/9172760966.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/47811866712.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/909c6065c512708a71e0e2f469df866f/gonuwibiwanonif.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o3n20i1u3enm03i1fnhjpvnkkg/49640933780.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/67a5c1fc8ccc128553345c9daa64b9f0/gopajonokutumawujosufe.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d9fdd61d5ab5313d0fde1fdfe83fd36d/19597766124.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/54dbaaf5e70dc918825d9405011c49b2/29732822401.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/35619867760e43961b07e7.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/vabawir.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/6555995534.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5620cd4ba---5443269183.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f854ed2b37---38841177299.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/likivonifozeguvazajunige.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9v9rvqtrbah2vp9lvoomk6ct6p/59093713434.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8c1e2m358q27vm3p68njfp2fvt/pasezimibijoluxadufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=science+iq+questions+and+answersPDF link annotation
    • 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_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 17880 bytes
SHA-256: 6646757696ba699d9b812be5b9520fa17ff77051da4da2663a3e1604f9f020d2
font_01_sfnt_off0001320b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320B 10724 bytes
SHA-256: 76584ff4cfce8139ea50edd2cdf2a38b541fc7f7a59df2aca810cde50c2a4e1c
font_02_sfnt_off00014aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1