Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b27baaf72dc3014…

MALICIOUS

PDF

76.2 KB Created: 2021-08-08 11:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 40789febda8b748c5f1951ceef1c3f0c SHA-1: 9bd1f779604154c7f732af8c7e3324371d639a77 SHA-256: 0b27baaf72dc3014d2b6cdb3c3ea6455fb64e5dc1c4f5abb9d9d5e91d972ae2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure malicious destinations. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/d35iu5nmqgkopi7344c5lcp1fh/20454584650.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717984ef97b---53933963316.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/34715774379.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/90b81cb02f1cf66361da0ccd26cfc933/57056841071.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/wopudekoxetusosejofizo.pdfIn PDF document text
    • https://roc.mn/uploads/files/96134282911.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/pibilinipewesuv.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48d16cc62f---puzomima.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf0fc3804---bosezixozuv.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/siwodisij.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9d842f3930351e2684583468f30771bc/bejonuruwuwenixawa.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6113c6a336---75544804890.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160742fbee3fcd---95440641930.pdfIn PDF document text
    • http://aldercrest.com/files/39429623382.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/dixuterizako.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071621784093---segadawof.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad355e2c1---lilafepugujujeda.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/nobibuxupuborumono.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/86428248088.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/fewalavazuzumin.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/lgk636omv55rpsivhm67it0gft/rilupatukunarate.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/vuwegud.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/meladi.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/muxidapenu.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/wazimijasoxomobonabot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=motivation+letter+for+phd+scholarship+sample+docPDF 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_off0000c4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 10944 bytes
SHA-256: db1e5c2c5689d3b84bfef6527005ac2a088382dc29b043b74434fd178b31d227
font_02_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 16528 bytes
SHA-256: 7d959a6c8397dc1a36a7632e9f3b1ee06265f17dd730056e5131a3dcae0968a3

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