Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd21f4d3fb87ea17…

MALICIOUS

PDF

73.0 KB Created: 2021-09-22 14:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9491a8f1b9805000629ec9fbf450ccf1 SHA-1: df132a7f5fe441be15b01b3c4c157eef914db1b6 SHA-256: bd21f4d3fb87ea1743397b7eb2d83c34825fd28a927f176514dc6c425fdc4f9b
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or raw IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://medvor.ru/uplcv?utm_term=irregular+verbs+exam+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614958badcfe0---rubikurekimoxiw.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/dogikeluwuseduzi.pdfIn PDF document text
    • http://jcpingie.be/public/files/nixuv.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/sogowejisatalirafiga.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/7818061176.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/s5r2fcns8iejvs1ku9v1rrvmk4/gategoje.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/78474735124.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/9201079860.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613A02C0C63CE.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/tiwif.pdfPDF link annotation
    • https://spvi.cn/filespath/files/20210902065921.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/25513850195.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/41598008150.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/15719244384.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/37158282014.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/mimena.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/lasotikuxi.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/wufarajeme.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161468d35ddab3---26479934936.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613695fbba440---tefuxokakimajifesosi.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/gazakuz.pdfIn PDF document text
    • https://adikketiga.com/contents/files/dafukisojutewasigidawe.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/kikudofizokape.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_off0000bb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5B 10784 bytes
SHA-256: f6fedda3a039dc3f11e33f5e08d62e245ee0e7dc3f6dfc318cf70a2904f5aeb9
font_01_sfnt_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 16620 bytes
SHA-256: ed973f0b9d57c5ce0a8e7475a44e6c7c2e77e952a187ea252c23b749d46cb94c

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