Malicious PDF — malware analysis report

Static analysis result for SHA-256 152c90d5297fa298…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 18:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f207801ae6e1fa98135e48b04b7be506 SHA-1: a6868152fd9b72e752f62ed5f741d8af37cbf92f SHA-256: 152c90d5297fa29814f040450d3b38453a86bdb136161e8af977f5ac5731ed11
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to disposable hosting sites, many of which point to PDF files, suggesting a link farm designed to host and distribute malware. The presence of a URL with 'download windows 10 64 pro' in its query parameters strongly suggests a phishing lure for a fake software download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/o37vou7ds2n740lnavovtnrt60/jotinosaxuvorenaperogujum.pdf
    • https://flardochform.se/userfiles/file/42289066820.pdf
    • http://kfoodntea.com/dataroom/file/70503085196.pdf
    • https://huaienclinic.com/uploadpic/files/69785960252.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/60ff8436792107ee5a24747482479f4d/41764354768.pdf
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/49480934557.pdf
    • http://birizgardenhotel.com/userfiles/file/39542153320.pdf
    • http://chandravanshi.com/userfiles/file/90648901677.pdf
    • http://inkjetartandimage.com/Uploads/file/98625133408.pdf
    • http://www.neoneofitou.com/ckfinder/userfiles/files/35915711436.pdf
    • http://automyjka.pl/automyjka.pl/userfiles/file/mewodimudatevufege.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/kalek.pdf
    • https://neksav.com/upload/ckfinder/files/97654592098.pdf
    • http://studiotecnicoforace.eu/userfiles/files/zowefomexerobe.pdf
    • https://thegioibaobicarton.com/Images_upload/files/9425816381.pdf
    • http://esoftland.com/userfiles/file/5117446053.pdf
    • http://botosani.ro/img/uploads/file/24693283666.pdf
    • http://www.siphonicflowmandiri.com/upload/files/25412683739.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/70934656703.pdf
    • http://lor-rostov.su/userfiles/files/7959503336.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5b236ec0675216dab9fa5fccaa9ec607/dadelesakuxisuregasal.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a284bc31b---18665348861.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b3724aa4---padavu.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/49044045505.pdf
    • http://vom-ragnaroek.de/uploads/file/93604112355.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+windows+10+64+pro
    • 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_off0000b91f.bin
7f4a7901802661975ec9733d8aa4567ae04109a0987db9328a60aa5e8a11950b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB91F 14736 bytes
font_01_sfnt_off0000de35.bin
a2c590fe91501a18a7b3182889ae9bc3192efc8b1584e6b753a49389f9981a93
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 10660 bytes
font_02_sfnt_off0000f6c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 16792 bytes