Malicious PDF — malware analysis report

Static analysis result for SHA-256 000b91e34dc8c293…

MALICIOUS

PDF

83.4 KB Created: 2021-06-30 18:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 86d2ab8c66383c6cf33ee598f1a7af4a SHA-1: 11cc1a202263ebc12777741e075878617b3c4bcc SHA-256: 000b91e34dc8c29337d85cfd661d137b0e971d7464c04b0656929fef0cfd3942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware delivery, aligning with the Spearphishing Attachment technique. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://richardchong.com/userfiles/files/50573054531.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad38282b6---zajamixiwel.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jelakopik.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be82d9d91b---32665708407.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bb94811c---zixujovo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2758f2094---55598066935.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5306feec---fizesufezadebigeritodiw.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4bc193f9---pusoziverivuzipetilef.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/sirepozokemezar.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/kirakelowepobisemokututax.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/tikis.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/burubonolepazemuvo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073caadc03df---31409971411.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d7eab56a378305739bdb2b648d130a6f/4119845457.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/96395eaa13ebf02c22f92a93aea9be91/84935551632.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/35685288692.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607481e496610---gibavebigawuvelaloj.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/zunujomabarigifanomabe.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfc431ce9---jovudo.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/biwibalabobefafewuliguto.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d93ffdddec9a7d4a0ca3ec63a874e774/marabutinuvinekudej.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/wewoduworuzufaj.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/74809030064.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078481d89b9a---48381763279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=transfer+function+in+control+system+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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 10956 bytes
SHA-256: ec449d76e83a8f1ccd5af5f1c9ae3f868ce413f66b63a8d6560d3e1ab8229b54
font_01_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 16184 bytes
SHA-256: 5629767b7d8746a2f6a09ea05da30eef7581e886b5a5ee734cd94cafbf22d2b4
font_02_sfnt_off00012817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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