Malicious PDF — malware analysis report

Static analysis result for SHA-256 401c187c08f84806…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 22:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18458c70c5904dba1c0c4189c0e5157a SHA-1: 45fd79cb77c3b10c9c762f5be1b4e5c381fa997c SHA-256: 401c187c08f84806cc7bdf8c979972332769b8ad8f901702af3b30c58efe9e14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, with several heuristics pointing to it being a link farm hosted on potentially compromised or disposable domains. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

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 https://gamma-electronics-eg.com/userfiles/files/11493692516.pdf In PDF document text
    • https://nabsangram.com/userfiles/file/10185955602.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/wafapumi.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/2125534803.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/79927443502.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/bibizazo.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210910_12B7E1E26689644D.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c7e675d7---nazetamixadogenuv.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/gogamekik.pdfIn PDF document text
    • http://retailcop.ca/files/31292933727.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb62176346---tizegofoguxoladopoloz.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f2e876f258203308751273b006bcbd41/6741093011.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/jegikuwenuvug.pdfIn PDF document text
    • https://digireg.cn/upload/wuniwivifab.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/67530029995.pdfIn PDF document text
    • http://ymmicro.com/files/files/sabelibasozurejusagujev.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/xukenulovudeledem.pdfIn PDF document text
    • http://dmkert.hu/files/file/98218108194.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/40390941230.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/76352083729.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/zevenopodilufawulo.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/21370201239.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/lolamejefimopixotomomu.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/somof.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378ebc67bba---30212522540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=a+clockwork+orange+book+online+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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 10828 bytes
SHA-256: 41ef2a1f658d7e8cde982c6a398ce403c14175958a0b266dfe8f7949361a7123
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 17956 bytes
SHA-256: 454611ce84dc3acbbb71d8e132f234274939d8c919b3cbb3f2521ded105be1d6
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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