Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03e2675f91bdf1f…

MALICIOUS

PDF

104.5 KB Created: 2021-08-06 20:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 662a9683e3496067393707636ecc13cd SHA-1: 48e2cdc98c1bc217c1d8d3a7dba7a67d211228a9 SHA-256: f03e2675f91bdf1f9c87c3e9f01abd80d75dc2c15deac46f2d6f66f4aed5ebc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL findings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8049e40bb8---84576726493.pdf In PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/72338077539.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/19294106884.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/320298058.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/3c8e464cb779eb73d8eca903bf3a1fa6/42703960640.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/2018181483.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dnqdjlgs6mgapvgheudb6n7ml3/80270330073.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/nuzajijatufuronesul.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0591b801c7---56980755486.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210520060703.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/dafumorivawapigopedefem.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/pupexizexi.pdfIn PDF document text
    • http://samtekelektrik.com/files/63730001397.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/bd36788656742b0fa67afcc40efb92e1/tajodob.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/30846585848.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/faxegiseb.pdfIn PDF document text
    • http://ashioke.com/images/library/File/91593141754.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785c990f4d6---xolegesokabinolezobef.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa28a1d62---gigaxafilewub.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/ludajidesaf.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/keviragabulaxu.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/jesez.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/dunebiwebo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1c71c66aa---17683778349.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc3d82d98---28579170863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cdc+guidelines+for+syphilis+in+pregnancyPDF 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_off00013624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 17136 bytes
SHA-256: 786e8f6bf51a699438b57018583d98afe3d29f3d6f3d5ff7c6c3b8a4e95c22c3
font_01_sfnt_off00016322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16322 11044 bytes
SHA-256: d48f461d917aa5ff035b505ad0febc734175b33b62f87cb74dbc7ef6ac89ce8f
font_02_sfnt_off00017c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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