Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0398023c4a0f53…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 13:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8975cd8fa9b96e206a5d3fd26de63d6 SHA-1: f06434f2a3077e6b85c62befdaa274ec3ede7016 SHA-256: 8f0398023c4a0f53d57efa782020c9badedc470382d7fa07db30786ad152f57a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=the+blackwell+encyclopedia+of+writing+systems PDF link annotation
    • http://lideparts.com/userfiles/file/1620920747.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/2042451166.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/xodowoloda.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///90082098775.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/japuzikajuvetevikemukoz.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ff3b1d255bef6d5acea0ab0dceac35b8/26015911455.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/c77c0e28211f005c2509965b5cf06624/wupeduxelerixegogaxu.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/52755367326.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/29822115356.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8a263667b5a20419bc59306f8b5afa66/45895233641.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f797596efc10630e5f16803794591c76/76902815224.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/jabazurapukofedefowixofo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c08db258---bugamixa.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/38133862078.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/lojusabivakozodamapate.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/kujokatavesorarerulag.pdfIn PDF document text
    • http://labonscafe.com/userfiles/27215887163.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/zafate.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fd6c8a5d0891189d57b765e64c4ac6f4/kofugemunufuzepuweji.pdfIn PDF document text
    • http://belst.by/upload/file/2435852592.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/14573775816.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/famot.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/74518034747.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/61136309258.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b7bed546b---79565323905.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/60af0e4191791ecab9055a9777118053/kamaforuvowesa.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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 11460 bytes
SHA-256: c0645fd43edb5c26fb3b272131bdaa5235d978ad48e4260b33067e26e20b7606
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 17652 bytes
SHA-256: 0ab733154d4e365624e8173c5b6da6e3b9b2f43fbf40fa63509311e14b83654f
font_02_sfnt_off00012831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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