Malicious PDF — malware analysis report

Static analysis result for SHA-256 a399cdfdceb1fc1d…

MALICIOUS

PDF

84.3 KB Created: 2021-07-13 04:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a170704d1563df6f18c1c1469cd511b SHA-1: 365073074549b3432dfdd5fce384c021ee6317c1 SHA-256: a399cdfdceb1fc1d749b01fe3e422ed4a62441ffe9a49d77037dd13fdb3749c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to phishing pages or download further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nomylo.ru/uplcv?utm_term=miss+world+question+and+answer PDF link annotation
    • http://bagiez.com/userfiles/file/dazimezexiko.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/472978c210eefa537b00734ba6219d4a/29394746015.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8ugvg0p115afc0s8bsq73slke3/61379988337.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5d5b34fe2b1e6ffb15ec00dbe75d5608/36040065973.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/nibugexamotumekogimasise.pdfIn PDF document text
    • http://midel.me/userfiles/file/fivabemavisipiw.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/46f5b87c5cf4161d00f7fc9986502543/71353131174.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d98b3ddb36f---josuzabimiwogu.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/turukobeko.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160898832d7505---xupomigi.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/fusamalowumefidulu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/nojolaniwefasologiveguge.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bceaf4a89c6---96435516508.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/81947817827.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/70527981845.pdfIn PDF document text
    • http://ccsl.asia/files/paropagovag.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef029fe73---fofazawotobuguvu.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/gidikasixizusuwejalefu.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3f296d868e8bcb8b9c6a4c175adb0817/82219335887.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/gfqvmn6ekks8baf6h109h4f4h7/lofisokirasoragadurotor.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/67666156120.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/epun06s8m1lvcjokd0tnq2lg43/supujanesos.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_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 10568 bytes
SHA-256: 69fdf2bef3a5bf67dc94fe57f12de5ffae189e98be3bc5176cae901aa71f60bb
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 17448 bytes
SHA-256: 867fedc8b60421da52bb1213aa6ebee0339861ea59c242071b90df11beff5782

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