Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dcd2682a4ffd7d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 20:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe8867aec923ba8d4a5221d9815c10b7 SHA-1: 21025daa108366d0dbca5aef38790245370af873 SHA-256: b0dcd2682a4ffd7d219720646e248e66f3a98c845d087c5638bc65c0106835ae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's intent is to trick users into downloading a password-protected archive, a common tactic to bypass security filters. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160736e0bbf751---tosibakekojusiselipasatan.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7926ffa1---zuxozusagewolesupekobapog.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/80364888270.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06433f132e---ledumiritisokagodagarer.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c7654bd0---59722640424.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/pirijotazibeged.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161111fbb456a0---sabonadijabumezatevudatud.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/futijon.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4ac82c72---tozosena.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02fa7d5a3---figatadifam.pdfIn PDF document text
    • http://talesma.com/E/file/taladijabela.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lusumegosavolepogobafali.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/46324226949.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/tenitudowunurepodegewoxe.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacd0b283f---sizonugep.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/fojamulazujosexigakowox.pdfIn PDF document text
    • https://suksesunited.com/contents/files/sejujam.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3da86dfbc---zipadapideludodifezixedi.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/60171420244.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zukixenaxoditigokorej.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10186064b---56880132812.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/48085824788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=minimiser+la+taille+d%27un+pdfPDF 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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 20444 bytes
SHA-256: 35581d5f5311ff67472d2204fa6a2ea13b7535fef154b7a6d1e461af39993e53
font_01_sfnt_off000116ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 10664 bytes
SHA-256: 9959541ccc180dfeaf1230e245e965555ef29c0b53416c9d630b7da57bac309a

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