Malicious PDF — malware analysis report

Static analysis result for SHA-256 361d4284ee83626a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 01:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0398f833b9601203d34df4f46f03dc0f SHA-1: 4b472567af03e9d1132ec4fff0c5204ffa38ff7a SHA-256: 361d4284ee83626a4cc7f0367a20beeadc365a349309ce777372497bdf7302b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on compromised websites or using SEO poisoning tactics. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a campaign distributing malicious PDFs.

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 http://lighthouseofworship.com/clients/44803/File/93068539572.pdf In PDF document text
    • https://rotitelor.com/contents//files/gebewalaperulozisekutag.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/6047709905.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/869540128.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/bunebisosigikuwup.pdfIn PDF document text
    • http://perksys.com/userfiles/file/11580583192.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/davemoferakugafusuvoziwip.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aidle2uhechs847j70t7h69pu0/tisilibijilogak.pdfIn PDF document text
    • https://hgb.se/filer/file/79630076042.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/xaxabuwi.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/1625694793450583743.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/45389903405.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4084fc5998d0b2013f9ef3fc56126bf2/13532205219.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae26cdcdd---13518406661.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/gatusimiroz.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/sisugapugosejisiromu.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/85690235323.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c57acf3b385f415973595afc252e1984/buganizavepejur.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1fc5b167872e27e57f4c5c5c5aefef2e/wumejirojijiwamiwazolufor.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b0e3f094ec2ffd18a428613952855ba8/fikivozela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sanskrit+to+bengali+dictionary+pdf+free+downloadPDF link annotation
    • http://medlab.webd.pl/upload/file/pewirexejas.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_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 20192 bytes
SHA-256: 5de83719b6a4ad738696c900c96ae2f4a1ce79ab63e4f68199b15b8fe456fae8
font_01_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 11300 bytes
SHA-256: c33b8cc5c3fbbf6a8c4f439920b358fb66702e34d5d85117a8ee693307ac04d5
font_02_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1