Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fbb45bb5256b5f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 02:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9b37e650aa47a72dec3c49feddc7a5d5 SHA-1: 2a4e2b2d758617f8819d3c0e33c3a5d5e8c8aca2 SHA-256: 04fbb45bb5256b5f343a360a00b8cf9f6813b0f5d450da9d1cd874b949e964a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://csc020.com/userfiles/file/20210628131450_rrb8lj.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be81d4c62a6---wojejinelikidi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b7ca6ae7e8b516f73ba535a12f67ebe7/ruxafutomipunugugimul.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/5c680ksoaimriv5o0pveivc1re/67934801261.pdfIn PDF document text
    • http://blgjad.com/upload/files/54009934499.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/24697312113.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e5b472160a11840e5ef604c9e1c2f1c7/posezanunodovipaf.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/50037fb4223454e433d15d6e3f454505/dapabava.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/84973287921.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/giloleb.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f39f77406bb---99213089915.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cdfe85165---vanizovunodisemosokekuw.pdfIn PDF document text
    • http://tano-cable.com/d/files/63562501074.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/69715290903.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/54733917295.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d7a179ff---mogumejovibinatukelo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/finirepixe.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/29068286881.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/rupemakavogemefozigu.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/2286964907.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/54915078380.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/vazaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=schneider+electric+bangladesh+price+list+2018+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/edae6809e8ddbaa02bc65a21a63b75ea/ronat.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_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 20668 bytes
SHA-256: 92c30e4373cdb6e1652e1cb54ae0194f5c20311b535c197978604e7687308744
font_02_sfnt_off000133a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 11496 bytes
SHA-256: b0e3a53316d7c5a62e82901270be4bd63f2eaca644e9c842f836849bb85d1fec

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