Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bc4350fe05d54e…

MALICIOUS

PDF

73.4 KB Created: 2021-09-04 14:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4666cb51b46ee137d1f50280f4edc1ec SHA-1: 36680ca354f16c5b818c1af16ba5534fcc914081 SHA-256: a3bc4350fe05d54e9021f7c1ebc5393eafe052a3417b52166e9d845f087c0785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and utilizing UTM parameters, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it's intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=acls+book+pdf PDF link annotation
    • http://bhavalaya.org/ckfinder/userfiles/files/96025938045.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/63321035712.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210701_114635.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/78182488981.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d038a9aa34d628c960fd5f4fe597ec5/rizujuromo.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/555bc7c1c9118b8d0b4411a19eb959e6/nopivubojinefuw.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/fosefojakab.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/91051717536.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d293181bc34---dozawibasavesigobugu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc632f2fe8---53710770114.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/eac6046932592287ddb99fe63efda519/10427399617.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/dirinivivarefunatiz.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/14626791662.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5c9cd6062ceac7500a05c4c61c8af3a1/74707616955.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/gupufuzibas.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/74493660546.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mavefofavuxemobapiwefa.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/22918356319.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7cb0f4a42704ebf50c40fa722fb7f71f/23289436555.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s2gnn8p2gsfajv6mf32sempjp1/xisafumakatokoxilumef.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/81319358640.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/bevezesisozuzobiriw.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/99095184814.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_off0000bf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8E 16456 bytes
SHA-256: 3c56e6a72b9677615b851014c7671a553bac3b2457835473f10c71592de13c91
font_01_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 10140 bytes
SHA-256: 33a1daacae739f393c76b731cb60f3bf69b014ca1548e5a07375b18b91f814dd

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