Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ef58fa8df1a563…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 20:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53540055b432444fa4d9020cebac6acd SHA-1: 922c9bb577f9a0de005d666a9c5e20d47890391d SHA-256: 91ef58fa8df1a563e9c5ee4afe85d200a7cbe4f87ce077d60d8d245445eef2e1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites and other potentially untrusted domains. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/anj9u86rc1mt17inm4ip5hlrr6/39529945075.pdf In PDF document text
    • http://pcccmiennam.com/media/ftp/file/jekinatefebeligogape.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161233ebb397a3---dexufimolafowamufi.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/xosufusovupiliru.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/bagemixajotugunukudujexo.pdfIn PDF document text
    • https://iwistw.com/upload/files/pinujutarobuzomu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/08a46e30e7ba2f9e6251bc81a023959a/43370031398.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3mneoab3slltm9dercgu159t40/87652709133.pdfIn PDF document text
    • https://btegypt.comfile/54473330983.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/851de2bc8e766cefbb0722aeb560b209/mavobebimototefizozoniku.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/10248086401.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b36840ad6aa---jifezawuw.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/t251gt1l8ufgbdlnaom7r71f8e/9485806058.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f595242a3b4709344d978789d86a9dbb/rozefakekovipomolite.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/nmj3oke1oqqfmrnptsp5o8st66/9311578637.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8f5113f1716816d70ad72998e7f8290c/siripixinegetovetigadofux.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/tulabaxovunarodufojen.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509a75c849---togekigipa.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/3334200964.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f0dcc6ee---18626363137.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321af3322bb---77758721677.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/sonufalululixilovis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mystical+cats+tarot+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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 19620 bytes
SHA-256: 80c1cf3578e586725f2b09fdf32f61c0a3a4cd575473134b609d65e30af5cd50
font_01_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 10484 bytes
SHA-256: c50ceb6c2d228eaaf100e40c8f4b411ea1aeb758be8c802e9ff7c97376ddc1f0
font_02_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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