Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11cc4e90a8f95aa…

MALICIOUS

PDF

90.1 KB Created: 2021-07-14 03:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1291323df619283623a02eeeffb7fb54 SHA-1: bd05c2c92a05a574c8ecec7ea9f433d68c6bcb50 SHA-256: b11cc4e90a8f95aac323aa359d4f1287a486c081f8e1b6d3d89489709790126e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links are designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=online+kv+admission+for+class+1 PDF link annotation
    • https://guruamardaspublicschool.com/userfiles/files/xirutu.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/24467565916.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/acfcad66d7ee59f591cae43b6f0c78fe/51199564184.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/zovatazozanexuxi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dllqqvqfort2opnbsoaapcckbb/zefosusetabil.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/lujinoru.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/25069050043.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f967731bed66d0db44979d74819de80f/31118186980.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607016471682c---sajofewunevadetajopim.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/25418544012.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0e0c0d6b---baxutuva.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18bf56948f---46769716097.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/42573166212.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/6eafa419f1741f4e616e183008ca4ba2/zemilizigozixopexakataxi.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2fbf875b3aa16d4fd9b81ba52759513c/83322387220.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/46667025913.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff95473db2---36919925098.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/82858986579.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/48989191398.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/95320455408.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/92un6rhtth123d68jfogauh1ns/34670303688.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nafijulelazono.pdfIn PDF document text
    • http://4bx.pl/public/file/deweke.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ba38a9591---potunefuvugexe.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_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 17444 bytes
SHA-256: ce09a0a35dd4805d3dc978a086cad9ec204ccb800c388b344554891b3a4dd527
font_01_sfnt_off00012a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14266 10776 bytes
SHA-256: 2cce5c118c7e4a495fae421d66857321f62c00a0faa0690ec50957e60ff2ad75

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