Malicious PDF — malware analysis report

Static analysis result for SHA-256 41201b3ba0581260…

MALICIOUS

PDF

73.4 KB Created: 2021-06-10 04:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1755897eafce382e7197b5a4dd610f84 SHA-1: c574a9314b33b0e4088aad469e91e83cfda16943 SHA-256: 41201b3ba05812609f5181354898e52c6c7f2e7325734611be896d8f9b4a479e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm designed to redirect users to various compromised websites, masquerading as search results for movie songs. The presence of multiple links pointing to compromised WordPress upload directories and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://crysiq.ru/uplcv?utm_term=salangai+oli+tamil+movie+songs+download PDF link annotation
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ms41d9ur0h08p88agh83a3v0nu/17701966179.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a849cfc68---91723160049.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877e3ee1839---34282750340.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ep9prgc7tmiqdcnrso2tksqm76/rexonanureritanufezunuv.pdfIn PDF document text
    • https://ancoraeducacion.com/images/37155634766.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/80262743888.pdfIn PDF document text
    • http://lawngo.net/fckfiles/54756250996.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ksu27u47dfb6366nklp5200duf/luzofiterirajizodubefe.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/t6isi5savhdr6l6ih1leqe4b3d/lugidifubot.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3d39091d---delagipevutaw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2b5a515a1b426e1981b36ae3f10bf4d5/89868363281.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/32060536934.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094666ee1384---14958155073.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a098760b636---nobitisonunilog.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b37e1c0509c5fdb24b95468a93eb4efa/18872209445.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/10197231cdb433950ac898138c01ce9b/29740104500.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/pugudobuvam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 5304 bytes
SHA-256: 38958dcf087084cb221cbbc4f02039cb2d164faf075ea8b3c1e448f95d9962cf
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 10764 bytes
SHA-256: 6aa72e94037bf960ab416372d3a7e0538d983d36e51af05550a4b2d5f10b0a34