Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf8218f801e4b29…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 19:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ba6b0b84bf8a8d34ccd8b46bcd98de9 SHA-1: a95ea61ba235df382d4e6f8303635aa2182fe1b8 SHA-256: bcf8218f801e4b29ea8e30bb197356da20b038a2180fba1903d42858ebe76797
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://raegcafe.com/uploads/files/gosisinudafobafodor.pdf In PDF document text
    • http://weddingdove.tw/uploads/files/202109101745103208.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cd863da5b0f99afa9fe54dfd1ac3934a/jilifemo.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/vimeginolokusumomux.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131fb0a8be29---7195931316.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/81178299580.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/91054305756.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/55812421117.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/kunafufeso.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/32595815725.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/59df6585ac2333b22eae856370200f7b/lafededosi.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/2760693703.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/68781726838.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/10887190984.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/mexabidugamafusudi.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/4616388765.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/getid.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/15705876025.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/43785669101.pdfIn PDF document text
    • https://hirurgija.me/files/19016929217.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210902_123023.pdfIn PDF document text
    • http://lejonhund.com/upload/69584886200.pdfIn PDF document text
    • http://indexone.ru/upload/file/83491911756.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210901234857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ala+vaikunta+puram+lo+full+movie+watch+online+123moviesPDF 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_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 17824 bytes
SHA-256: 81357f81d2279651b0564ab22ef0914bd21a2f9159f94639ab483e2e2f9cbdc1
font_01_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 11416 bytes
SHA-256: 613b91f354cfbd3c1cfdf424711aec246395cdbc6d68d048b91a94ca9c429dd8
font_02_sfnt_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1