Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc535587bb3c37b5…

MALICIOUS

PDF

71.4 KB Created: 2021-09-21 00:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2b677aae6040ec502c1376c1a9b5a8f SHA-1: 5fe55e3036ac84b3271dee4f01d4171f8c1f0a6a SHA-256: bc535587bb3c37b52c141897d632cf05879575afb1a58cbe6c8b74259a7532b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains a link farm with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/208771492958de201c3d54ae73b135bd/73307306287.pdf In PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-1/20210901054621874475.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134bca7ae87c---47697785941.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/864j2j09t3ud0asufajn2er0t2/14685639965.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/gepopivubesole.pdfIn PDF document text
    • https://ptogel2.com/contents/files/35556107264.pdfIn PDF document text
    • http://mobilenmr.com/files/files/vajomar.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/9618682642.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/71799906688.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/81128337661.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613427a60ff8c---sabikuwijapowitu.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/legumoduvotipolajo.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/navodojamiv.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/52662546507.pdfIn PDF document text
    • http://clingac.com/d/files/dudiledetono.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/jalinolorakenil.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/92418845034.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6a808179---78608305412.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/58291497456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hd+wallpapers+for+android+mobile+free+downloadPDF 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_off0000b884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 15372 bytes
SHA-256: fd036c06353de4981faf78c60569c2f4c9251fb8103506ffebad01e6fc64fd4b
font_01_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 10776 bytes
SHA-256: 4f06d17eced5fe7dc8d8bf4f0b8a884921a8a7209ba37ac57755e0489b029af8