Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0a71f8738c6e3e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 04:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 800895fa756ad18666d6b510b8a852fe SHA-1: 5f9ff2b5eccaf5790c71fa896c2abaaed4c1f524 SHA-256: 3b0a71f8738c6e3ee91123a82a7bfdf0f2b7f10178ce12e20c123e6696d31945
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ilturismoinitalia.it/userfiles/files/52252844561.pdf In PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/16785981892.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2b5c79f4---bixagewinifuwiz.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/ketugutafolilaka.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/23260515455.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/wedowufer.pdfIn PDF document text
    • https://akemi.ro/hirek/file/pixufitifepuporusizomebox.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/905e0a6a4102cc6c363a9f3f8381f74f/17443580158.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/88395925840.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/6844702624.pdfIn PDF document text
    • http://standdominica.org/files/files/92376073482.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/jemiforafemizopufu.pdfIn PDF document text
    • http://3sdent.com/upload/files/judasotazabaxadefu.pdfIn PDF document text
    • http://warehousetraining.ie/images/saredarumebasedexuwe.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/domimixibewivugad.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/zogida.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/tururugibenolebafamiri.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/mixonedenikodiro.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9a867a5a---wudokalolegu.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/25739323415.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/tetonovolitonetik.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/42627922994.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/demulemajasese.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/98499c250461ddddc4e882ce99d81794/zufusuwesim.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/60442914637.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/melugotovovopedev.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/34454440324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=nfl+games+for+androidPDF 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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 10576 bytes
SHA-256: 497a1b5344e0d916e2aa3087298a141df72bb9e0d0632ea1adb37750b790fb9c
font_02_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 17116 bytes
SHA-256: a114e6f86d563d87a641cecfd1d1f15f44a0ecd1b2fce3cc7136325658283a32