Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d31ad8ed7b4c773…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 19:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c0ace32d23be7c6f190ad0d3ffef640 SHA-1: 51437dd4553b773068061121661b55d63c907068 SHA-256: 5d31ad8ed7b4c773cc8ae532704bd4533a1848491880dad303c831243a1bb735
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be compromised or disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=phone+cast+to+pc PDF link annotation
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/79280163182.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/33856953656.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/41585567917.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/75b31901ef0d610416be698897033139/xusonasarilanuwalakapob.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/26860452870.pdfIn PDF document text
    • http://feg.vn/uploads/files/16938147661.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/74315015623.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/xepasovolosorixumadije.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/99587667894.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/73320932840.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/88740065676.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/67e6ac18d94c061be6baba2ff2fc7e6a/75274945218.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/tenil.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/13547134571.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/leleborirajatuka.pdfIn PDF document text
    • http://atek-ent.com/upload/file/7197589000.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fujazovetamutizukedul.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/79815242413.pdfIn PDF document text
    • http://charontrade.hu/data/file/guviziwofizoselijolabujos.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/zapepegilamaxejorev.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/022113426498.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a440e1a3c---mofelenepadibogemep.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/59331678966.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/girixujet.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f844268d1c---fominusagufaxutodelurifir.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_off0000b31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31A 15120 bytes
SHA-256: 2e7a1c13f18ae152e9c1c741ec357631f9db3335d3c383cac4035f18d839a3bf
font_01_sfnt_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 10236 bytes
SHA-256: 701ec35bd19e101b3ecad25dfdbadacaa3e7da7317e5fbd5876c35c9a9b7c1e7

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