Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d895d847155e367…

MALICIOUS

PDF

90.2 KB Created: 2021-07-15 23:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a4a9b0b1468e75981f5c2213380d0898 SHA-1: 976c5965b7f61bec698f0b93dbd4f8e3f8522913 SHA-256: 1d895d847155e367d7aa34f4abbaf7a2d873b1df6787a97c84135b0396e6c152
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 a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. These findings suggest the document's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/k5snssrqniem1iscb680702ii1/29054552290.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd32ab7e8---degenaxebivunobe.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/99b3bd4b84141aa283613a7ae481b9da/rajalowez.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/27555539790.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/88696343013.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b84022f4---29786316648.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/212f164ce00024526ad7bba24c149384/wawow.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/mirusibemusofipotozexo.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/89822431297.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/23473598624.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/besagefav.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/dasifunapiwitakuligogoge.pdfIn PDF document text
    • https://afayl.com/userfiles/file/13899182366.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dvgv4946dut2m073bs3ibof4uc/58869752754.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2e0bef0e---89177503586.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/h5revnmla9h4frhu9ecnuinc2b/gugomozufafaketoxiga.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/asj4ubmr44mcdjsfvg4giappk2/81348456223.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c866ae8a33d---dosodosedusamegixokewak.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/tamagozupesibalemuz.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/47509f34d42aa992afa29d29d3990bd2/7007493393.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/69031446913.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3e4553b8b---46701559164.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f83fb29389---98710664255.pdfIn PDF document text
    • http://vejwun.cz/images/kegowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=daily+stress+inventory+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_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 10672 bytes
SHA-256: 76b54b9f4f9b004bdb11e98955213a8e3891117fcef8e41c7a561f64ab71ad93
font_02_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 16708 bytes
SHA-256: 5162f51b4468c13a7a363123af82a5d186f65e9db6eac75e2f1b8a78ad18c165

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