Malicious PDF — malware analysis report

Static analysis result for SHA-256 7405b2f619afb8ad…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 00:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f923c24623be3c6aa40a4c85e9e322e SHA-1: 2b5e74c7da875ee77e5a57b72db57356cc61a0d6 SHA-256: 7405b2f619afb8ad6bf331f8a5d7cf16c925c7ea25163fe48e76020c933aa427
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to host and distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and URL findings strongly suggest it's a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://konemara.hu/userfiles/file/wovamapobapezufuz.pdf In PDF document text
    • https://cuisinescartier.ca/upload/editor/file/53651105846.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/29471669772.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/tisilebosopilibilaxas.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/tujova.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/dasiridaxubomimubo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ad818053---lodipalat.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/89107230838.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/47006458967.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/71981795862.pdfIn PDF document text
    • http://cx-gl.hu/images/files/juvuxopiz.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/17623570773.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/64836852164.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/tafezujol.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/49235339105.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/36114914467.pdfIn PDF document text
    • http://zamgph.com/uploads/file/050728162894.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351ea60a8d6---76875633983.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/wibimatopikirejilubit.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/54873264308.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/kabenofo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2f16c4a2---xajozupujidov.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kovosadujojiwobaketo.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/47620047133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+fire+red+randomizer+downloadPDF 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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 10488 bytes
SHA-256: fedd048afe34f4a72d4e7afc8bc1b1a1beec038a40d60ed6f67151b0fed33e61
font_02_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 17412 bytes
SHA-256: 141cb9ff7eab1e8864877d2ff7f16271e72126201820d8d50c43a9088e06fe7b

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