Malicious PDF — malware analysis report

Static analysis result for SHA-256 be75f58294ee2881…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 22:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a8fbd62e5636fe373b5b82c2e0dbcb2 SHA-1: 924f0a772d60e430894c7aeb5ded8b7a5f750b8b SHA-256: be75f58294ee2881fddccd600dd793ff7cef567bfc509da5cc984ecdfeb147bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it's delivered as an attachment via spearphishing (T1566.001).

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://cgmorenanews.com.br/ckfinder/userfiles/files/tofarotelakegepoduka.pdf In PDF document text
    • https://artbynela.com/uploads/file/69616805333.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/vudevuninowusibidod.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/narigikasejetodavodamimu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161518eeb70db8---tifomabixalu.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/zekafabepizanax.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/28750045153.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/85022803864.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/199161622.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/8599383139.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130c146d373a---vofixijuzilipuvadisuz.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/85900589606.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/21351634398.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/jodibuzowitisizi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/724f9d33ea89f87fc6bf43b37e14ad50/luludewipodixu.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/40739649424.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/5257356776.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/nusuratibibuzowezimilab.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/kelikexaweleso.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/lozoraritigewenejakajebu.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/nirigakunegogezubuwaxunam.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/xuvatijeloni.pdfIn PDF document text
    • https://x-software.cz/data/file/tajikobipuzosoveso.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161354bc71f995---3404038986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mr+and+mrs+smith+alfred+hitchcockPDF 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_off0000b0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D2 15528 bytes
SHA-256: 99b0b0bf91f9fae9d0345dd6d57a7326da2cb22e8e8c7744ba83415b62f5490d
font_01_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 10828 bytes
SHA-256: 68481e434633520ccc2b9d51243cc507516401c8869ac7662abc98bca54de949
font_02_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1