Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24bef92c28a60f9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 02:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e36b2fea6a611206db7716e70fba435 SHA-1: ab646b3745ed2b9f5a20a367539babfa5b60c3d7 SHA-256: a24bef92c28a60f92d171142904423f4c856f33b52a8dd72c933c77605d0989a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=ufo+enemy+unknown+apk PDF link annotation
    • http://polishingmarblefloor.it/userfiles/files/nawina.pdfIn PDF document text
    • http://geose.ru/userfiles/file/86906917818.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/80509492901.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/cf72ae120cdfbf4cbce3da9e63515be2/folamakomi.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/kfonuf1cahfbsb0qc5f19dcsaj/nunuwadepizaxadituluvas.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/kivenekeroxufawebaxu.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/koputomatominusaw.pdfIn PDF document text
    • http://lawngo.net/fckfiles/26448593367.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/94735878761.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/pirekapav.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/88194225790.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/gafibi.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/lasolunu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/97643e6d226e42a8b659ecd6ce295d97/35691258944.pdfIn PDF document text
    • https://ocw.tw/uploads/files/53662141927.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/82595350568.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a5a802a7---xofapibazamozu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/poc3e2dme8j6n20s4nk8neqb80/16036173922.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/70730613769.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee7ae441d4---bipovusurifiteb.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/zubifemukipav.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/busizatijetijek.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/10265222870.pdfIn PDF document text
    • 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_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 10416 bytes
SHA-256: 9b0643478a484ecddc14949c6f31282985f8566d0ef4c7664032a1962f16f04e
font_01_sfnt_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 20864 bytes
SHA-256: 674c68840f29c214daeb43913906d57a2e3ab39002a32c9689fe152cde4efc7a
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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