Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a076cbf1bcc3e0…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 15:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b13ee09fe2cec812547fd4be0e521b5 SHA-1: da93c1a0d8ed509a9e9491833fdaddd71bb438f4 SHA-256: 67a076cbf1bcc3e0742533e034d7c65d39bf0cdd40ed1843d5d099c3673cde0a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. This suggests the document's primary purpose is to redirect users to external malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bd1126ad---lobesezowe.pdf In PDF document text
    • http://5percent-design-action.com/upload/users/files/runulo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e63938cdc1---68365556915.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d2f5d7c30---26183152359.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160793752c43c1---76090102333.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/g5mgdplh0k96ehtq4o8c1v7rhj/13058639234.pdfIn PDF document text
    • http://intertravel.hu/_user/file/76755207623.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bb9f488e9---vuripibesumad.pdfIn PDF document text
    • https://strechybenesov.cz/content/26272581825.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa95e79dfb6---35159669202.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/66040558871.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/lupezafomoluratu.pdfIn PDF document text
    • http://aps-mes.com/files/file/1624842898.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/813044ba2d5298fbe69e03bc55c18898/26132074631.pdfIn PDF document text
    • http://jkohut.pl/file/mesero.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/kidirogugewivi.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/mowagafesenetimo.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/20602766231.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/479197c48951a4cb52d03bed0a35f169/wenadonagejexojapu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/n6llqr9be0l2v3tnndh7gfj4a1/91981750736.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/7436729440.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/pemalojuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mdas+worksheet+for+grade+5+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_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 17504 bytes
SHA-256: 2b1b715415bc0c6753f01aba1adeedcb03ed31b36ee245434a29370e9bbe225c
font_01_sfnt_off00011a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A15 10840 bytes
SHA-256: 92ebb003a764c1ed693b178ca00dd4fa38f325675cf768316020d80a88d7388b
font_02_sfnt_off00013332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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