Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b1dd443142cdfa…

MALICIOUS

PDF

107.5 KB Created: 2021-06-29 03:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8fc423fd5b848308010dde7527d5b9f4 SHA-1: 7b4e2d3343f8a758454b426ef169a96aa7e909f8 SHA-256: b7b1dd443142cdfa3c3121a5aade6c92a582c2f8e6504cbc83fb98eb276bc8c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to the likely use of these links to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://klairtransport.com/uploads/files/55295007938.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a51accd6244---bagoxugavegajalajiburegem.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/puwuf.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/33740988750.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a168e18552191e68fc9e8aa29167fd44/zejofutej.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc267e414b---vowumitix.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160971bb89b03a---nebujakakobotutefazeked.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1e7ed995f4777bcc5d07ba4b47802f46/mofajawewovotikigesini.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/4790835476.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/bb0755c983d185f8466848c2c52d41b6/pabofopubagafasugubegum.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9vfmevkpodt6nc7j89es2qo223/1349245438.pdfIn PDF document text
    • http://veribase.com/E/file/3794741060.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b033fa8f62---taxijoxafogogisitudi.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8b5de7dbe64c6668686b72ed4d68f9c5/56383050666.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/perewefuputolilutumufi.pdfIn PDF document text
    • https://luminex.pl/upload/file/deropufagipudibidebovux.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/pizaxebewerosemuluwava.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7o83tln4u1prjnbgjefmo98r3n/rosafikus.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/q3htcu60eeuqe289t80gtlmt42/35392983639.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/85130323771.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabce2992f---46724379153.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/vekepekonale.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/raxolipefenu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/46936511402.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879124d76a1---60240832866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=seminar+report+on+artificial+intelligencePDF 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_off00014308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1F 10732 bytes
SHA-256: 0f1284e11f7cd2713f76a2896eb7805fa37a197ccabe8b7d57251a473b08aa0c
font_02_sfnt_off000173bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173BF 17076 bytes
SHA-256: 07734faa192d19c19cfa729ff6e3404f2bd052e6900c46cfcd936fb7c14976bb

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