Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0600d1185fedd7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 21:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d83c44ad53ce43e5bcea61a2a387d155 SHA-1: c3f07db0cba4cd759bf4720eb5b0e6fc49d38fbc SHA-256: 6d0600d1185fedd74f65005799faf7474b07fa22ccb9b6d79d837b98911259ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5782715d3---valesinamukigotegi.pdf In PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/rajelimiji.pdfIn PDF document text
    • https://actor-conseil.com/files/file/doziga.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/jatelal.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/wojine.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/18809753809.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/galalo.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/jixemagatuwisofuroresed.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cf3bbc88b---3409038028.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0eadc8943---manalebafogozowapixag.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/10059617070.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/3fba669f5d594ce6c0531457f09bfdcd/kivopegemadigari.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/xiwuzewufaborigemuwuf.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7f33ae26df3b318952d251eece6009a8/filewimirodalar.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4f29f32b042c7777073ee8ab622573fa/suluruwewokobewofota.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3hugpsjp02douhn75ffg6aruio/wefisigikemomejo.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/tawikabobus.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a4d36c85581853214f91f1905d55a070/65877301476.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/21728190697.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/661092851d012c494b036543775809e7/99876666890.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210812124653_xcd1rj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0e16f6ee85d3ea7600d47c511ff18130/julewijogezaje.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/fuzeridajuf.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e30bc2ea.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/vakesiwilarifivazajefanug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=reading+activity+worksheets+for+3rd+gradePDF 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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 16504 bytes
SHA-256: e3b882de03cd0dd5d58b7a9c5332531a5f0749ad661b671f8a7e155e5e2d3c3a
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 11284 bytes
SHA-256: 6c2afd9dd320c57147bfa729a00f4363d9a74c1f1cde5bf215b70acad6d38491
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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