Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea3d3da850ff22e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-21 11:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8bd4fd5db9455e5a17f28e5e1da49a00 SHA-1: ca3fda6fb22b2aaa1b4c8ec02fee8a543b085586 SHA-256: cea3d3da850ff22eb3a05865598fe760804a95b630c027934ff5866d6382e013
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://telektrans.hu/editor_up/82158959453.pdf In PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/34266389079.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/23504233428.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/7483373636.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/15335882174.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/94504756952.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/34615773342.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/74292033670.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/1442639612.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210906112205.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/35394739815.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0a5b493f9e98aec4aba96200f8728839/41177831755.pdfIn PDF document text
    • http://reichspfarrer.sk/file/15360291280.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/lofax.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/doxosakijijekowufipikulo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a8215ce---fawila.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/32414589872.pdfIn PDF document text
    • http://robbes.nl/media/files/wepuz.pdfIn PDF document text
    • http://rococosofa.com/files/files/wisaluwezupozoguzonegu.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/16241334247.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/43899916201.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308d1109871---1655819968.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210916005413.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c7988e9c0aea85bf0e1bbbf675f58128/fagawatuwukunanaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=a+quiet+place+2+mp4+downloadPDF 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_off0000aeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEC 10916 bytes
SHA-256: dfb09d0b6f75d6c7d9f2df81c8b1608e87e76b93a840b669109b3f2c5de61fcf
font_01_sfnt_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 15224 bytes
SHA-256: c8629f044f654c7b640ce01bdca74e1872c64d3bf5bf7bd021138c2bc9cb0cc9
font_02_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1