Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca03c914c4b964f…

MALICIOUS

PDF

97.5 KB Created: 2021-08-04 23:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 965ae0c2b77c7b4636c3c863530c8687 SHA-1: f1123508418842f1eb33ea59da35de649f9c880d SHA-256: 3ca03c914c4b964fd1263b8c96819105765eff0186212145ba4fc3306aa1f640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ozmutludokum.com/userfiles/file/fojikatotimuxudeli.pdf
    • https://ortechindustries.ca/ci/userfiles/files/zemudikesukotarusopakamej.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/piweniminodowotopakulezaf.pdf
    • https://usdcp.jp/user_data/userfiles/files/vijuteruf.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8c38a4e4---pewuzudi.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/lejikak.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/fufakizagebijali.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6e16941e---jimifitofarana.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/33402303538.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0860b82d385078b48d835bbddb20ef93/babowanefabe.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d46d69ff8---53280459225.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9932e29239aa3c457a710b20df862250/pipunanonutapax.pdf
    • https://12tiga.com/contents//files/lamuregemoxabariteri.pdf
    • http://guides2alpes.fr/uploads/file/50743650408.pdf
    • http://pphu-joanna.pl/fckpliki/file/tadajesopijuw.pdf
    • http://tunesistudio.eu/userfiles/files/jexizazafodi.pdf
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/xibinupur.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d641dfd724c3cf55b7a9e5e2eb3548fe/25439274420.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160962206ac169---sidibibudag.pdf
    • http://intelekt.biz/uploads/pages/files/bikogogovokuwerele.pdf
    • http://occahomesearch.com/userfiles/files/45705722059.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a40005b9346---lizugu.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a855ea7258a---61796912926.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971285be546---81726028425.pdf
    • https://semangkabiji.com/contents//files/96607307560.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+time+on+yoho+smart+bracelet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 16792 bytes
font_01_sfnt_off00013006.bin
4dcd82c0cb825b098cf370a64550b5591694aa89e760980d2f935246c3a1a117
pdf-font-stream PDF embedded font (sfnt) at offset 0x13006 17572 bytes
font_02_sfnt_off00015dd1.bin
98b23fda5199e67164a30f5c7d3424da7ba9d4a18d5bce60ca17ae8fa31072df
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD1 11008 bytes