Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3aca71403349e96…

MALICIOUS

PDF

69.6 KB Created: 2021-09-14 01:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 533ce8f82fa0aa6a6c32d37bc0775b3a SHA-1: a37554a3cb2be3ea265e6c3866fabff5b3026634 SHA-256: c3aca71403349e9679a56996877dbff42d1a4eadd929dc42ee4cd9b562e7e1d9
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 or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ibrahimalsada.com/pics/file/dozilarenakamuwipuxef.pdf In PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/54428999418.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/38654182708.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/wijisug.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/68135765485.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/40984535959.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/32749096246.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfe2297a3---zagitakokilipaji.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/fanijeponixuz.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f3ada322941ea76dce583070d7f4aa8d/mijufubukazikamebilefi.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/sexefepilogewudunajudi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613172c473a05---gaviwejujebifi.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/88047583508.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/76217676438.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/77701049226.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/vigiduruta.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/69529488927.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/25182785129.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/xafikolipejojamituxoxowo.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/76152933479.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613190980d953---78622231553.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/dilodosimonanuzanarawup.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/bazetu.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/47037824937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bride+of+chucky+full+movie+123PDF 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_off0000b18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18B 10980 bytes
SHA-256: 55b0d475e710f3e7c0f57991f6f24f72d2b366dc25fb012412f1374d149e4a56
font_01_sfnt_off0000cb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 15020 bytes
SHA-256: 584986ba35118fd728667b530e2a794acbfd7e061177433d1eec5dc59d68d855
font_02_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1