Malicious PDF — malware analysis report

Static analysis result for SHA-256 5101b37f18a79c0a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 20:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bad9d1d2648a17f7c7d968e88e5c1ab SHA-1: 13834e6af3d2703e87e4a5b5ef3ea2136ed629d7 SHA-256: 5101b37f18a79c0a2f0288cfa85c9e173f5d7ffea6a8cbc997bc6353fa3c180f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=share+phone+screen+to+chromecast
    • https://rougezenekar.hu/files/file/20512148520.pdf
    • https://a-guskov.ru/uploads/files/wazexufutotiwubajepovote.pdf
    • http://moscowballet.ru/userfiles/file/kedudafut.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/83256575378.pdf
    • https://triyoga-tv.ru/userfiles/file/lesukorulip.pdf
    • http://avandcie-energy.fr/ckfinder/userfiles/files/46915040972.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1ffeedabb0c8c792a93efada7ed29e30/wowuforodob.pdf
    • https://kaptenhoki.net/contents/files/68841791032.pdf
    • https://koncnc.com/genelresimler/file/xunuxufimikafe.pdf
    • http://twapp.freshkon.com/upload/files/zebepupuvelojo.pdf
    • https://vanphongphamhienluong.com/upload/files/vamuriditora.pdf
    • http://wsospice.org/uploads/userfiles/file/file/97319317386.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lq1bac5hsfdkkni1u5n6ug76ms/84365627895.pdf
    • http://sbsinternationalschool.org/userfiles/file/buseno.pdf
    • http://2m-m.eu/userfiles/files/71346193365.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344b2205d91---21701303220.pdf
    • http://missteenqueenuk.com/userfiles/file/69805014797.pdf
    • http://www.binghan.my/userfiles/file/puzara.pdf
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/56596891148.pdf
    • http://snsi.jp/image/news_file/59098029652.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/53349211024.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16132d98b58f44---jeginexe.pdf
    • https://accounting789.com/ThImg/file/9304678166.pdf
    • http://imailbox.nl/images/uploadedimages/file/namufenugujatu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4e.bin
a3219a50a0846e66b3223475343462c91abb8a26f72f6472759de48e401ad9fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 10576 bytes
font_01_sfnt_off0000f741.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
font_02_sfnt_off00010f53.bin
e50d94a92437ec030f0711a711a9febf1fbcdd6b72c209ed8754b8c7ea8865eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 17812 bytes