Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e319c34368e8073…

MALICIOUS

PDF

78.3 KB Created: 2021-07-23 13:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c55d3eb43c5db4834216311b898f3cd SHA-1: df5665ca7e0c067a691272a1838d6b33bec80abe SHA-256: 6e319c34368e80737bc924f50614036e5530d465f419bfb8b510172729d0ac7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://derma-dts.de/files/file/xakakipijatewovuz.pdf In PDF document text
    • http://china-hold.com/UploadFile/file/20210610033257045.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/zalogomipegujezasimel.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/likagadometaf.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/954c61f4967c09637e9e0f32fe300a9a/53059252526.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/11cd92dcf0b66b1d8048899a1ff76d51/wuworavij.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d372ef8b---poguwivetigodabitopi.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/25769277628.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/gozinezivifozizuwobuwovan.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/15155189483.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff3826d26---wadifonuvekovujoduso.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099014c6e4a3---boruzivapi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b05b4ec41---mafolivexizudukovotob.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/53922522275.pdfIn PDF document text
    • http://htcable.cn/d/files/31336078959.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/pulokibugeponenixu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd51878cc---73259663564.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/cacd3d92f438781dff27f62a1d71f0af/fuwekugisud.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7ebgp8dt6h26dhr78evsbvko0b/8286046914.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106301953217828.pdfIn PDF document text
    • https://seerupit.dk/assens/file/fipogopizavaboloku.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/p728kqo9gkq0umitk18q9kinei/gevidokugotejefu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f568318ef1f---falabivusotexajipajabumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=y2mate+youtube+downloaderPDF 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_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 15264 bytes
SHA-256: 20fd8b710d9e8e8e6b5c083accccdfbc8e68cfe8a44ac04c2fd5b24d30309ff6
font_01_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10692 bytes
SHA-256: 3098b70f2697a5a22f10c71b58c6bf2fb5100bd71b1163299336d23a2cfc8817
font_02_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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