Malicious PDF — malware analysis report

Static analysis result for SHA-256 0444da1eebaa416a…

MALICIOUS

PDF

88.9 KB Created: 2021-10-06 05:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ff23eebe48884e21c76de5f6cce27a4 SHA-1: 2909ae6ff55a0df8d648f58f0e5f92e7bafd1b29 SHA-256: 0444da1eebaa416af5440c2ab063c338e526c5ee5a3f2a98dcbacc10cd7e69e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://nexxosrealty.com/userfiles/files/vijirekikipixiligorig.pdf In PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/kagadi.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/murifegedofukode.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210910215519257770uj01d.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614702e086a8c---19291948636.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20211006021803.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/kifanedes.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/trjq23if81t826hgd41rcheqh3/salodidelez.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/paduxijusod.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/numufajixijedinuruvazuxov.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/generijabiretemamitisi.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/12634116325.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/gijurusupabim.pdfIn PDF document text
    • http://livestocktool.com/d/files/vararefuja.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/fotimunisebiko.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109180626121832.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161504f6e8e5c9---13931036999.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/tazinakogojuvu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1055b6d49001f54d6b4b72d4d0b51e9a/jovomekugifasiwep.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/vusidevoxexuv.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/52674053313.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/gufipope.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/fodolipuxabozi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614552188b1d8---44764400242.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/16264101243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=clippers+2013+rosterPDF 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_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 10476 bytes
SHA-256: c041090a8b2d6c0660f33ea6898be0721f64ca936c99b6bb84a9143e5defcbe7
font_01_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 19232 bytes
SHA-256: eb6327432b8056778a3e08d513ac66e964193e04507846cd2623ff1ade4b69d3
font_02_sfnt_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1