Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d47822ad412b88…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 02:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa0225dbadbf1dee7c7d1ce2a33afd41 SHA-1: d9ad0725741cc90e8436266430bb242ab59bcede SHA-256: c9d47822ad412b887fca92dfd5bb787fa8597322dfb84c575a9a6248953d5557
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm and employs a social engineering lure to prompt the user to install a browser extension or update. While no scripts were directly extracted, the embedded URLs and the nature of the lure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/wigenugetonulusavuwufel.pdf In PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e963f51f6f28351711570abb97f0c7d8/7913768160.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/77138767732.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/58226710352.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/82576041234.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/h9d7taag1o1m7ks2dc9lrbo3j7/30419796210.pdfIn PDF document text
    • https://soechi.id/userfiles/file/58063759588.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/63906844939.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c26d97b6f---refupukidujumazi.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/52610335871.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/94746611547.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/fipusomadezevukuxe.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/96706224735.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/dekubasefakadif.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/vepegegug.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5b128097---29339394799.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/10222086830.pdfIn PDF document text
    • http://beta-rc.com/upload/files/92879150529.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/93532731857.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/keguzu.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109091523017522.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/fezuwegaboza.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210907072217.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/pazevokezobasu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7cee1595748fcac9979938a93b1d3d74/nujikudojakefovalenida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=keystroke+history+chromePDF 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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 18364 bytes
SHA-256: e53810d3803facd6130015e1df04eedb68975b395ef9be845f8f5261dc0b264e
font_02_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 10380 bytes
SHA-256: 8771895c34ac7038b076102a3c9b9fc25b6527dec2900cec894b9a5a47c3586b

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