Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10cd348c2e13c04…

MALICIOUS

PDF

71.2 KB Created: 2021-09-18 23:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a48fa44e162740d3cb9e03ea5311d671 SHA-1: 8e030054957b6104bfa76a1d88188ca7c710a675 SHA-256: d10cd348c2e13c04266a4e5debf7d7060d583c595d13da86e9fdebe77243a6b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The embedded JavaScript stream and ClamAV detection further indicate malicious intent, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://coretry.ru/uplcv?utm_term=watchfilmy+hollywood+movies PDF link annotation
    • https://vr-spagna-20.effievirtual.com/galeria/files/xegak.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/bifopimuxewevoduvusos.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/binijudedutedud.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/wofopejifadox.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/51043024744.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/12583804551.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/loluveneb.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7e41efb8---66694392719.pdfIn PDF document text
    • http://reichspfarrer.sk/file/pumogugetivuj.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/rarazugu.pdfIn PDF document text
    • https://uudanbury.life/files/file/temebuvu.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/76915310822.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kanizadurobezorasotoxoru.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ibt1i9jdnum3lbar8nh7q2dhrj/werezunuzozatuveridid.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/67113054679.pdfIn PDF document text
    • http://mamitobe.ru/files/file/66847030012.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b6ac488c---punugozam.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090606173529.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/3956735735.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfef9c9b29---53205674220.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/61444223051.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/jepisovexasuxojapekeles.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_off0000b63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63A 15924 bytes
SHA-256: 1abf3fef09a61022326083d2f8a876c3b48f9f7579966e677ff37ac095e5d5d3
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 10796 bytes
SHA-256: 871091db70e411aa0ad53e63c4c02c470107cf52604c7e5f72172f2d6d8a21ba