Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8b5a580f1a9ea8…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 17:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56dd0fba3debb3ee83f757ff83d8857c SHA-1: 4a9e0922d4876d380da7cff2d20da71db5286e8d SHA-256: bc8b5a580f1a9ea8226b8f741be3465d77a9aca27bf4d92f6c38530210053931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The primary goal appears to be luring users to these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1d36b6e8---ramekalalolanudatasurin.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9713pkvh8nl4ffugjatr58g8rp/75351774048.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/71716966813.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c635df8f---71383892705.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/rudojajajufovutinixapep.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/sasago.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/foladodosajeduxodila.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47ea17ad74---mofovurenakutobel.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8nl4eg2pmthpb0eep8bl4e1gi8/17180635444.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/22fed19a1a476524d77b7090f2864b7e/32723158790.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/69047207993.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/rijomuvaradej.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4456076392---62575155326.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/zameda.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/20b900f2db627b9b208e93e5e84d32cf/komijuwaravivewosar.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/27855704927.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/vaturifamopumoruv.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/35193986697.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cb9a2b2e09d6fb2ae9f70a67277a1471/45440641017.pdfIn PDF document text
    • https://webhosting4.net/media/file/12974175143.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/71394497181.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/foronugixawef.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/xolupugazuzitekef.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/46808455935.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f521fd3425a---27443862297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=roxio+easy+vhs+to+dvd+3+plus+manualPDF 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_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 11156 bytes
SHA-256: d5f8cd89c5689504daa2b62debc096fcd3a133752dd552058c7d410ec65418c7
font_01_sfnt_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 16036 bytes
SHA-256: 62c06a8809308b2ac5bb43a679c9f9ba76fa884bb491d54c87f0b9348ee14908
font_02_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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