Malicious PDF — malware analysis report

Static analysis result for SHA-256 647f85a81a47e9c6…

MALICIOUS

PDF

89.6 KB Created: 2021-09-08 08:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf5afcf3d25205aabab136d5b135107a SHA-1: f2e802c183c19417f7ed529b43e8a921266b4166 SHA-256: 647f85a81a47e9c6acf200c4e2826ac35829e0aee830a84991f358dc5a1bd40f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The structure suggests a link farm designed to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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://changrung.com/ckfinder/userfiles/files/wefirejosotopokapamivo.pdf In PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/pafotidozuvizepejidipuf.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cec19160bf7---pazesuju.pdfIn PDF document text
    • http://edisonprivateschool.com/cote_dor_import/admin/ckfinder/userfiles/files/fanipa.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-23/20210523094702439520.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210613_072106.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f87214d5b---83713975950.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/xunow.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3e6dd347ca2d82410188bf6186c97f97/tibopususamuweduwe.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/48830038122.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/89112942257.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070931d54d3e---70764125684.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c734f251---dakibuxa.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/99545088394.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/14220085601.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/su86nvnaoh77va1th845dmf9rk/lazunedogavuzojiwa.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/96636040016.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/llke8m3vad2i501ebimnhkj8f3/gapakonemimada.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/gevoxepetizufinuwo.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/37937868842.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/32533705621.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/gamewukupapotunebube.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6d85715c86461362e05540c1905ce2e6/gozowulutexulagila.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/20297160037.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/39126688428.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/fugobinoput.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2e7736fae63014aa2de63ca66e2bb442/vefifulusiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=less+agile+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 22400 bytes
SHA-256: 79642f4f29075cdeec57e6675e221c7eb72507cd1e16127a1f847c807f8e99bd
font_01_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 10208 bytes
SHA-256: 4ee917859c7372b9e6e6fed335935c05d104f9a36d18272fd33bb9b8d774bc8f
font_02_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_03_sfnt_off00013ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1