Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00fa709b6f0215d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 09:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bca432d47fe04543e617f8aec67bab2e SHA-1: 036b26e5705734fefee24b6b4f9039124bb07245 SHA-256: b00fa709b6f0215d34b9300922b813a756d3480375fb07bc7520ea855356f995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on what appear to be compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=usb+storage+running+out+of+space PDF link annotation
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/12337804434.pdfIn PDF document text
    • http://halaljones.com/uploads/files/sesezimurosumetefipupasij.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/36925824615.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93705292770.pdfIn PDF document text
    • http://leeandrewdavison.com/download/rolixetabejegedu.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/6059845996.pdfIn PDF document text
    • https://pecintajp.com/contents/files/laxubuxukojivesokowizure.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/15998433105.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161347366cb311---lilolopidigudironup.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305f7bb66c9---zevaxili.pdfIn PDF document text
    • https://ptogel2.com/contents/files/wugukiwipebikudaxoxu.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/pijijug.pdfIn PDF document text
    • http://matras-devison.com/upload/file/5405935999.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/80948022923.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/dezolajozar.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7dcb9ef2---63309044532.pdfIn PDF document text
    • http://nemochem.cn/upload/files/78375419057.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/90505536024.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xolatulamarotawu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136708cadc9b---kezubusezukulajofuviride.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/50077707517.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/zidesogasomikun.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///nexikazixulotewodizurama.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330e4369ce8---zexagefewolevaxididaxek.pdfIn PDF document text
    • 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_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 10856 bytes
SHA-256: a5a44833b1b60ade958ea9120cab1f790e80e3ec699f8c1217e9cf1cb1cdad4f
font_02_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 17692 bytes
SHA-256: 9be04347b2f70640564f6ade7cf2067c68ee7b38b8974fb29310d64e795dca94

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