Malicious PDF — malware analysis report

Static analysis result for SHA-256 d397c03024a4e260…

MALICIOUS

PDF

76.7 KB Created: 2021-08-30 15:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8639c62b17cd31e7779b1490c6dfb0a SHA-1: 41013ea3c5be7c15979f4bfde3669435e8061a08 SHA-256: d397c03024a4e260695d54144c5e482cc84d5212aa3b1368c941cb5204e42a6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download further payloads or lead users to credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://octvads.site/js/ckfinder/userfiles/files/tagizutot.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210817_12F900D39555E081.pdf
    • http://titadoorbinhduong.com/upload/files/zufole.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/22176570099126879e84b7f46960d2b3/13069140751.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4erv9hbmlo4e1d9sed3ce4ekqm/38537576158.pdf
    • http://klhl.com/userfiles/file/60645712457.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8340b85db3---56162399166.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sulujadegeli.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a6608039---besasavunidurufinazitoton.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/f3bv4p2tkh7rn3iogqlefh4ja7/nuwotaxawosefi.pdf
    • http://jamxmpharmatech.com/upload/files/76669296318.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ed028a98958e1f584a138d5c1218d1c7/gunivutufabamotajidirut.pdf
    • https://fcksa.com/ckfinder/userfiles/files/defanidasakezilomujiwela.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8927e7ef---93637752887.pdf
    • https://amblamy.ee/upload/file/fovejezumedogageju.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/3579741.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611af81182f3b---26661309200.pdf
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/13528127340.pdf
    • https://5a.ro/ckfinder/userfiles/files/medix.pdf
    • http://aihyang.com/userfiles/file/rojojosi.pdf
    • https://comptables-publics.fr/userfiles/file/monisajulazezogifunuwezuj.pdf
    • https://cincia.ro/ckfinder/userfiles/files/rofija.pdf
    • https://akemi.ro/hirek/file/34841514337.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e3f3e517e69cc32f9b401a53bc03a49d/15077975602.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+weeknd+ft+future+comin+out+strong+mp3+download
    • 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_off0000c292.bin
17f67b39720a6b7d9cffbd4a0a3aa0881b572499136c1a50b04e6404cc054ee8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC292 18020 bytes
font_01_sfnt_off0000f164.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 16792 bytes
font_02_sfnt_off0001097b.bin
1839d611442ef2932f3956ad26186785a8013bd16a4a1abc351e9ce5408f4a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 11480 bytes