Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5a229b4dfde59f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 20:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59b3cee7c1db3544edc4fcbb1dc2f59a SHA-1: 595306a53750a50d39e6643374682fb6beb2f6ad SHA-256: 6b5a229b4dfde59f5fc253b0a073e049d4899a469d2728663885fd303e275363
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/20945118585.pdf In PDF document text
    • http://aspbae.org/userfiles/file/roxanorokatubulekexomokop.pdfIn PDF document text
    • https://mauspro.net/upload/files/51416338910.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/sefubiwel.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/73425584859.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a0ccd7f5df2a1494ac0deb0210d67864/jawevivuzidorojubelaj.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kedumizodud.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/gigufafupepolunagupu.pdfIn PDF document text
    • http://sbkf.org/files/files/3525965192.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/sagad.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/sozoloxarudiwudosugeze.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161324e8d8be84---bafabuvinipum.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/saxapamaxomafovubew.pdfIn PDF document text
    • http://minipit.com/data/files/zubepafoforukuba.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a90e24d7c---xurovep.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vifaruxo.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/30924052740.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210907142715.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210908205303.pdfIn PDF document text
    • http://planetamama.ru/files/file/rafugewezofegikopave.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/bejijaxunuf.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/99991100251.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0cc8e572---69990880440.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/lojumegalatudetivuzob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=firestick+not+detecting+wifiPDF 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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 10600 bytes
SHA-256: 1f1aadc3a076ccd7e22d1e07759e3681039d906a6d8d6a8c2341b47aee0ed82b
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 17604 bytes
SHA-256: d7e3a3d66bf92aab3c8e4630bba4cf27a29c0fb4d9e5dd9a656e37889b59d038

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