Malicious PDF — malware analysis report

Static analysis result for SHA-256 d021b12fb28988f6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 15:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d393f6ddc84f3b8fc9c3177e0130e8a6 SHA-1: b4638cf875d411467026151a2997b7071a16875d SHA-256: d021b12fb28988f677f7836899bbca7e7b0d369e0dd56738d54ab927587dd39a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 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://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/be5bb936ce7b1b4fb6e4f7c4793ee4b5/44964488137.pdf In PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a110e01ea77---zifipuronevuzaraj.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da827d654---maxaxid.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/56e99301f1ab758efe1091bcfe21f50c/kalijavatisod.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1a7bae4aeddc3b85543e713237a39ae6/64889114497.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/doriboferemuvido.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/19637989874.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160de3b8f12155---54725655413.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf960d7ed---42929274712.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/67867395353.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/jonelowokepizef.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/3725143489.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/foliluxi.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/42db6b083ce7cbbd7c5a5b5f6d82cec5/poguxogomego.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/14405291208.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/zubaxu.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/47578112827.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/nufelulatowetibixa.pdfIn PDF document text
    • https://norservis.com/files/files/88194792739.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunonakifode.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/lavagurelefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=roche+9180+electrolyte+analyzer+service+manualPDF 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_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 18292 bytes
SHA-256: 48d11c0ff339a50a2e68bae15db8ec62be937b7488e13062f37670ae82d30ef9
font_01_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 11428 bytes
SHA-256: efa7007a59e7308bbc5b990c580dc3df716640446dee51304e20cd6944604c79
font_02_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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