Malicious PDF — malware analysis report

Static analysis result for SHA-256 099312d9198a1a41…

MALICIOUS

PDF

85.1 KB Created: 2021-09-15 16:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47d1d497a7fa6e6e1d65bf461ba50da6 SHA-1: 7835410a759d3c584f10f74e185950810a3ebc07 SHA-256: 099312d9198a1a419fb022ee4fa95d7a4c63a8aa5685fd8f10b96b24bf7937af
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised or disposable hosting sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bftt.marketsearching.com/upload/files/defeporuzoxedokozi.pdf In PDF document text
    • http://queensparkview.com/image/upload/File/lalezuz.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/33014851647.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/46754231805.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140924dbba13---23209649182.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/995d3efed4aacf88467f1ab04ffdb13c/volatiluvofeluwepoz.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/2797917514.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04f5a6f29---puteboruwopaberure.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/32079227616.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/xovasutoxifa.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/sanom.pdfIn PDF document text
    • http://sbcnepal.com/images/file/97812489961.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///52159083481.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/df2893ad3d29e3cb55c864aa870d8bd7/vujajixerafivujewibut.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/kizagilewalumorod.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/xesikexumofosomijoziper.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/41508737572.pdfIn PDF document text
    • http://checopharma.com/upload/files/damusakuxin.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/96505157253.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/bosubajonil.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/sanibe.pdfIn PDF document text
    • http://leton.pl/userfiles/file/95273373901.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/32441804505.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210910135543_yckk4r.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=call+timer+pro+apkPDF 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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 22148 bytes
SHA-256: ebe273a0f691fba9cb13418d0844cce5682763b877a8428bc5224c614f312e06
font_01_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001300d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300D 10264 bytes
SHA-256: 451248ae6035688fce4b019a2e7380e25de8f509c198ba121078b66372024982

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