Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d8233113858d27…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 09:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d2b25ffbce4d78d9d82ed40a3bae2bd SHA-1: 0aff95a941795dd1465801cb9ac14eb2243cfb6e SHA-256: 36d8233113858d27a64cd0c583dccef6b98d717bc2cd7ff68b47a1aef4b07a80
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to leverage SEO or user curiosity for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=elsa+movie+full+movie PDF link annotation
    • http://www.itidharamshala.in/images/uploads/files/zageke.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f1a00638---79637717015.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/90762446950.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161475cf3b918b---fitejonidinobibedimox.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/zogovapifegusazira.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/89469911765.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613366d1b45e2---pamazaponelomujuxe.pdfIn PDF document text
    • http://zeci.nl/im/image/zoledibugaxomosulelijop.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/62066362281.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/volilowisujebozovuxefu.pdfIn PDF document text
    • http://rvhifi.cz/files/file/87946335500.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613154480a264---85490060572.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/vegakogupilepividewaja.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/fogotedevamutu.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/wubofos.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/giniganemuloxogilapudala.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/mifufunonakizobakewe.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/36551429172.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614565a9914de---13193057827.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/metutelumewewimatidasefon.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///49765345193.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-12/20210912190542637552.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/93441381499.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/gowimujenuburuj.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_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 15240 bytes
SHA-256: ff1bc89bde82696aa33e17ba6abc5e6f3fa033045188d7960e0382720e329ddb
font_02_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 10220 bytes
SHA-256: f9f56b3f81b2e77d3e1491193ec545e1c9953cb6587910e860ded3258c0b6395