Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bafcf84c7e2a7ee…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 03:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 186000ea25d8642f1b37ac7d8beb2ed2 SHA-1: 99d16cab688a1549cf1d76bdcbb45a46b09e9e0f SHA-256: 0bafcf84c7e2a7ee75bd6a87dda92924c6f2579c2daef376bfb4d187021fbe2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://flemingdecal.com/uploads/assets/file/jagamudaganuxevutuw.pdf In PDF document text
    • https://airshow-bg.com/file/lesajemudozugarimej.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/88184105759.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/dujafet.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/665114fd26a25ed63404dc5144b03ff4/14215050854.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/jagagofakarigabovosewagef.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/58830956434.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/42180631709.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/1274206850.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613291d5e6de2---nakigonetowidazula.pdfIn PDF document text
    • http://coumert.com/images/file/nipinikiluja.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/jipivitopoguga.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/86831051729.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/4022450482.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/38312250873.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109020222430732.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/34006619436.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/77371558961.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/liremewosadedeb.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/49980824126.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/fibamujisoritupunuxin.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/kinogisexeduxis.pdfIn PDF document text
    • https://tdfstore.it/file/74120656762.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rruffahscru03ptob6kdfubn4v/miremeg.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/79506886875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=discrete+mathematics+and+its+applications+by+susanna+4th+edition+pdfPDF 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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 19332 bytes
SHA-256: 62a938e54c883a3047034da943b121fbffa61dc5843fd13a628cb610fdc7c014
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 11320 bytes
SHA-256: 80261d9ce73cd02e7164535efc128f930a74de8ef4f35a142fa428e5c47a45bf