Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f1d808fdb25fda…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 07:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 57fe09f32ef659f1197704fc7fac54ff SHA-1: a179facf02ea0855e448b6352fd5c10659e5a767 SHA-256: c6f1d808fdb25fdac403838a16d446144099d300f1ca9f54f0e96d74a9a8b6e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://westhigienia.hu/editor_up/50951037358.pdf In PDF document text
    • http://tamtamphat.com/upload/files/46539389349.pdfIn PDF document text
    • http://machin.kr/userData/board/file/66786791821.pdfIn PDF document text
    • http://innotack.com/userfiles/files/27794731275.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/33310499388.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6f7153d1---11666627045.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b10fd39f0---tevumive.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/66654842664.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/loraxijukofuvamubafebuwi.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210906165228.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/57893612710.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/61844305703.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/86806699517.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/wupelemukelobotube.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/5408214309.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/47605919697.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90400b223---xazunanijexegezov.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/vejiberaxaxozunuvuguku.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d640b91e99---tavalaxuxiwaminimukopodax.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/14003175429.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/weruvotexuzedemosusekaf.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/xoginunuxofazem.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/21563181800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=modern+combat+2+black+pegasus+apk+free+download+androidPDF 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_off0000cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 11492 bytes
SHA-256: bea21b707eb0c22e0af6e9e103eee31d48d9bf069cf00faf1dfbb83844be4e44
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 20440 bytes
SHA-256: d2a68aaab3474ba6de810be061c6d15906cdf4583937d0f86746a3402042879b
font_02_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1