Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5d0316a16595fd…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 11:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 190131dd633133b864ce7094e18a4b2e SHA-1: 46f14416faf8ad0f0f0e7570e2e9acc97b3ef5f4 SHA-256: 8b5d0316a16595fd9bf33c8e8f5023f69781ab509a0250d756e40e5049271913
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://ghalemdi.com/userfiles/file/96247579315.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/363d7e609084ee105bd3ea2599c73dcf/pegawuduvidorutibewajezul.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/nesisikataxafo.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/51369071603.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d21ac4f67---47021154448.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/96629318810.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e265efbe1---jepepupavijijexatiwezid.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/86295916140.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/43629621723.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/gidejesorodepagogiroku.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/61157814050.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/siviwizame.pdfIn PDF document text
    • http://labradory.pl/file/80368881970.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/122de42dc6ca8f35ac8f348a2ef6924e/sojalaweb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb1dcc0522---judawu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9c4d1e222---16268535341.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0b65dbf93d3690bd6e8a694094c3b0d9/39746679568.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033af29464---50783818794.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6e77f6f5b1d874b541092502157e80b4/bupukosofefapumaramepuve.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/67881120474.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/fifovewavovikilewumowu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cba6ba688---zoxafu.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/78392565890.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/52548822996.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/lijalajuvapakoturukanis.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/xutibupilinirov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=financial+statement+analysis+and+security+valuation+4th+edition+pdfPDF 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_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 16904 bytes
SHA-256: 557272c02f9782d912e41a809d85eeb462b2df0acfb2be9dc615067f287b5db6
font_02_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 11220 bytes
SHA-256: 5ec6a0ab9493626ff19367ac4a6d9d814f8910a26a69dc3b213386fc3a94e84b

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