Malicious PDF — malware analysis report

Static analysis result for SHA-256 5999f18462b2acd3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 21:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b8e0bb3cf1f842bf18bb879e708f116 SHA-1: 70a9e6e8fb3f420e5bfbe6ed2cd6231ff289b7ff SHA-256: 5999f18462b2acd307518c62dc49f1050d3846a1d2be108f1685aed2437c4eab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution lure. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=menggabungkan+2+file+pdf+online PDF link annotation
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607883ba10df8---nepawigazepanozowubo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4uvqc3kmuqjgnt48ubh8h2qkvc/97438773717.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/begufugawakaze.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a105a8ff9---53851447480.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4300cd40fc---55231831745.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/sutovelezofebologoximo.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/32469946755.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/woberip.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a761d31910---xataponeke.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/nonivejuxuzedibivewajab.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/73613717237.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/nupefewovozif.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/52155217605.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8e7fc0a3d6a90e00369a6d73f8a52d3e/78712311038.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/26662688066.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/jugugiwokiduvogofi.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/47225359040.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/307099d6c1bab198eede2f7e98b669aa/kovejuzokujo.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7bb00bd6b---boxopoxiroxoralakarapok.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a01dd59f3d0bbe01edb8991b67b5706/68679310956.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/bpfjo80oo02ijm6n4i3v7ca6on/sisimatikeme.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/83335754144.pdfIn PDF document text
    • https://dragulf.no/files/file/rolefudujusozalap.pdfIn PDF document text
    • 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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 17148 bytes
SHA-256: 6f313314042553e1115fb68926411e522e5dacb12884eb0dd24502ab600f2f9a
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 10752 bytes
SHA-256: ba0444416e6267affeec83151d1d7556d4e360b24560b34d4e4d30d92bc46d2a
font_02_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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