Malicious PDF — malware analysis report

Static analysis result for SHA-256 996d3bc3ac13204c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 06:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9db40ee04fcb2230ed113553fdf101b9 SHA-1: eb9553a37ed8e0e64a5418b4db05830ef4a2461e SHA-256: 996d3bc3ac13204c1666c1931109bd7d32715188e49a945085cce21a43c7990d
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links, many pointing to compromised WordPress upload directories and disposable hosting. The presence of a PDF_JS heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5415

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b7e626ec8d41878334b3011d5bce6a12/30922983848.pdf In PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/bajerowolikeboturevivasiw.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0840dd4b---toduzazal.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ad0802bd5b45a2c607e1f3f927212c74/lofemesox.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/99350162510.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/vuwevasetibebejun.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/pavapolizemow.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/tukopem.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd32f1e5b3---43296048941.pdfIn PDF document text
    • http://debten.net/UserFiles/File/27627129425.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/lurivujukeji.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/nevanomadomagowedog.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/200677647960fff147f34f8.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/82394265651.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d45490c3d---36182289739.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210716114250.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/xemerarutitafe.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/tedapasodomijad.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858b7c5530e---20090722089.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/11428208117.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4d5d76b8308805f76902bb587525de92/wiweragovosex.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/48395491984.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20218463424.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ffb86975364c48fd842794b6375af832/pulasujades.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/tamedujemove.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/bakadetikalumigir.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/1601679986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+granulation+techniques+pdfPDF link annotation
    • 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_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 11220 bytes
SHA-256: 7cbb55bfe8c863c350a6b2ff155d72ab74e93017577094ae43a76b47680494e5
font_02_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 17476 bytes
SHA-256: 35c35c02690ece9307f38a1e5b6b4e3ef8e98290bfa5bf1585f32945367a4471

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