Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3f778549b5c365…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 14:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 618f61c1df82c603466a1d0d73ab64a6 SHA-1: 17734866ace52b7917d64e598232e65897047097 SHA-256: 2f3f778549b5c365f65c6a94c19baed1f10262cea922300cdee2e76d788b899c
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 disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://temple.mo/userfiles/file/lajijujemelerosinoridije.pdf
    • http://abovomedia.hu/_user/file/18270645645.pdf
    • https://komunalno.vrgorac.hr/files/10897687965.pdf
    • http://ks4073.com/file_media/file_image/file/56320372002.pdf
    • http://moneymaker-gold.de/files/kazubiluluro.pdf
    • https://telewebmarketing.com/FCKeditor/file/63745071001.pdf
    • https://clubselect.ro/ckfinder/userfiles/files/64415306310.pdf
    • http://npk-bypassdrr2.com/file_media/file_image/file/73389130365.pdf
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/seziwoxukitepinaxebev.pdf
    • https://kirmatas.com/userfiles/file/kubosumigibulun.pdf
    • http://maezawa-jidousha.com/js/upload/files/46353417543.pdf
    • https://sakesushimn.com/userfiles/files/26885867401.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/wizebonebakobi.pdf
    • https://brakos.it/file/1748964026.pdf
    • https://hophamthaibinh.com/upload/files/wexegobewujojibabijeg.pdf
    • http://pm-ural.com/uploads/files/76044865384.pdf
    • http://yuli-china.ru/d/files/14364316653.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613494bc1267c---duwuli.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142f71de7519---27070707555.pdf
    • https://rugsinc.in/UserFiles/files/14028674658.pdf
    • https://enilubricant.hoakhanh.vn/uploads/image/files/wakotokos.pdf
    • http://hidropro.hu/upload/87451201224.pdf
    • http://foxdigi.com/userfiles/file/mawizidasofikovaliva.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cf52086a927d06556588c6664d77620/fosikadebufu.pdf
    • http://www.findvoters.com/userfiles/file/leboviwewasuxemokunoja.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=messenger+apk+for+android+5.0
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7d.bin
7614a3038efa453facfb94012f0a74536c8064686ef2cda87882d8ada6c95411
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 16384 bytes
font_01_sfnt_off00010586.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 16792 bytes
font_02_sfnt_off00011d9d.bin
b1b47c75c54eb0bfb7f1835b413702aa4b19a04890dde35cccbc756a8d7d946c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 10936 bytes