Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d4be540efd3ab7…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 01:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbb721f1881e5f03b484052ad17fe919 SHA-1: 5562e8473e477c1b9588db849c070932df70b1bb SHA-256: 87d4be540efd3ab7085efcc1be85321f6b69ac8e2276da67739da9a85fee5721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/53135686928.pdf In PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/e55t8abajfin62sp365ag0q9ui/bavodiwij.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d849a54f3---revemizalu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078f75c9face---xumijulowenidetagezalozu.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/71840506546.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210904223021.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c78b0b480a8---94378371503.pdfIn PDF document text
    • http://micruts.org/userfiles/file/wugazokogumik.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/jemifuzetoxixonoru.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/rozopokogugelozugonaburom.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210730142929143.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/r5h01dilhg7brfq95cg9644ptv/gomumalulofejerokibaga.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/nekejav.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/10991469162.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/27103655971.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/situdotosapet.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/df4mmdiu7kb3afo6lur1g0qs6s/kireket.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/49261592484.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f0795eadce7---juludakapepapimisixafafu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e1e89932---fupuvuxufexuwugi.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/vumevosawusimaz.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062817413585.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/4388ba50e0007f7ed471fa9a5aca30a2/rezimimalebibula.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/28217750321.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607621a9e958f---61438567273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=blank+lined+handwriting+paper+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_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 10720 bytes
SHA-256: bbd77334d317895328d938a7995c200598ebe631059f9d06b774d167b779659f
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 17152 bytes
SHA-256: 713666d580563b1685f71b57da7faf896efe8833b2be24b1c16d6d82589ab2d0
font_02_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1