Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a532bd590335ca…

MALICIOUS

PDF

102.4 KB Created: 2021-09-02 23:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ecf0850b4810757139c53d53f38f747 SHA-1: 4536716b982b5290e3da135b4b2cfb17e68bf7d9 SHA-256: 24a532bd590335cab154eb07268449606766710b232a6ad03010ce8be49435f6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics and URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://abugfreemind.com/userfiles/file/gobutumafezedevevotos.pdf In PDF document text
    • http://fiumevivo.it/userfiles/files/34079610346.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f04d7b033384f3637af9ce5a98c1df38/88520692687.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/wilekuxaduxuz.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/zivaxan.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/l6gee2rn3paha0nvfjavg69kt4/44934640296.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c6b229fb7---loginoresuradavenusif.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080eafba6e9a---61936920097.pdfIn PDF document text
    • https://luminex.pl/upload/file/47800185496.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/xowositix.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912224e9877---19331718678.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0iaf85qm3ucds162m2bq9p7eo7/53947317699.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de467705a---mazerujizekavux.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/1564532942.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d0c0f75b5074d61c02176f748dcbbf69/13805655160.pdfIn PDF document text
    • https://bloomeng.com/uploads/tifidomekemomebik.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/gafas.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160868d4589254---38237346001.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f4c8d0064eaaeaa12793f645a7407a47/fojakawerejere.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1db84e9645158a692d8beb50347846f2/navif.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6166ea04---10820053991.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/oma925avv5mr3i0b8smf3qldcl/pezokomesumobusivadotusu.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/mulefuramob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=insert+blank+page+in+pdf+shortcutPDF 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_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAC 18904 bytes
SHA-256: b5f87185990be2011865ba125f9eab5b07c083b301bcda5e2743f7c837720514
font_02_sfnt_off0001724c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724C 11180 bytes
SHA-256: 91ad1a3d51f71c28c6bddb460501ff88968db2dd0ac25400f7dd4d302eb623b6

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