Malicious PDF — malware analysis report

Static analysis result for SHA-256 f403142785be05ab…

MALICIOUS

PDF

85.7 KB Created: 2021-08-14 12:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84d1b42c43ef35d22a3c38b0a346a2f8 SHA-1: 290e5ae0fa48bee599232040b43b07dcf51553f3 SHA-256: f403142785be05abd7a7717fad3279335e13bace24d98b0b04234603ec832693
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing lure, likely designed to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a7a85bc0b2b916d9694db5affdb1e80a/88784866454.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec62faed91---movadusokawusodu.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/tepunusuwatowozapotig.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1627108448kepitapo.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/nufaki.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/75834523235.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2b1d06cd4---dukuvopizira.pdfIn PDF document text
    • http://k1a.ru/images/files/file/jiwisigikodatoruj.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8c41413a---1668198631.pdfIn PDF document text
    • http://12shio5.com/contents//files/66271724412.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/sidudivugowof.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a1ddac5c9937e4227a660aeacdc7ef4e/87620758364.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qkcnbhddvh61ncc857eiigobl5/38050868633.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/f4473826895d7b9ab6ce1ae38e4a3d15/dipovibulov.pdfIn PDF document text
    • http://qzgyhs.com/Upload/file/kegivofelelunazux.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f24e390aba5b82116562102445f108fe/7057282.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/1883148342.pdfIn PDF document text
    • http://altinay-law.com/images/file/sikubudutupu.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107181313358635.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/79345452929.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161059a983cada---zavufomatedal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+write+a+project+closure+reportPDF 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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 16872 bytes
SHA-256: 6e61d47fbad49ff9ab9dfecb807303be4dea87518762640f69aefba40a815570
font_01_sfnt_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7D 10572 bytes
SHA-256: 6f7767abb74905ed16aa1427da02914cb87fa155743827576720dd33e9bf3073