Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ec893a4a0be70b…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 02:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fdfa7abebae0b3e88ef18d4f44d33026 SHA-1: 7c7ec3b486372aa905643366b67679dddee4982d SHA-256: b2ec893a4a0be70bf4b4b24403cfd0fe5d6d4862751259fede9940026d21834b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of these links and the detection results strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8b49e6b270e3f5f187eb17f3b6c28396/68290071859.pdf In PDF document text
    • https://businessservicesuk.com/userfiles/file/65162202904.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/41789575458.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/jeludexep.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9709d3f587---dudosof.pdfIn PDF document text
    • http://brenderup.ro/mm/file/5591053668.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/81544319464.pdfIn PDF document text
    • http://congluc.com/upload/files/zokudarusigiwiponok.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/25fd4ed9c742160eea7bfaff6b2235be/57033882579.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/djcgm22vpcvg3na7d8noi2pq94/73386730127.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc7dc87930---73344445035.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e803e39e---naxifevamogikijudaw.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/tibodevorewevuxubokufunub.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/2568504580.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612548244f86e---36207777961.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/guwiguxari.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877b5eae997---nanuvoduwa.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e25d1a56---60810265987.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4216d89337---daleli.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0esnh2m7a54di8ejk5j1drov3u/42588406872.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///79548350489.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/lisegiwimoxaxuji.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/70377076578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fisiologia+aparato+reproductor+femenino+pdfPDF 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_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 20432 bytes
SHA-256: c0103a3f0fce51797604981281f88e4bbec0570a8fc69f59ee7cc8b1cb1f1413
font_01_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 11040 bytes
SHA-256: 43eb2b6aff323ad855242d31f6a4849ed550c21e830c0e6a03a6661b37a6bcaa
font_02_sfnt_off00013ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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