Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6e6c0ab5843f28…

MALICIOUS

PDF

76.0 KB Created: 2021-07-02 06:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9938fddf010b32ecd921f10e60eca181 SHA-1: 78a909a32acb5d3baf61393bf49978b055c70191 SHA-256: 9c6e6c0ab5843f28b9c46b52f6c2acc531fc66832a684a327a966e07e9146f5f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/9315b8fb0d0ec41540931e4d368d1372/99297186075.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/qhqeseoue4a6g0ahvt6rsv9tio/37910884031.pdf
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/80384013889.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3307a965f6---zawiwo.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/neromokavubujo.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e3d5410ef013a0583fa06abd1b6b6c57/64115488089.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/98d2161dafa7982d13077c412d41984f/97518916487.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0b954ffda935dc9cb88dee25e7b4719f/pukulenivifibegawakugi.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883d252c80e---rewafategeb.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/t3d894t8sjt8k4ogtr22q3qfng/tonimaxilevemoxazelunevil.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/fratvud3ucgbfvngf846p9soui/24449241691.pdf
    • https://superpart.com/files/3452978199.pdf
    • http://shuimotongyuan.com/userfiles/file/xisetamepadoxoxutonod.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ce2b9274cbe3aed158f6a761d094faf3/lefagenuwo.pdf
    • https://ckd-otto.com/contents//files/liwevarex.pdf
    • http://weberstellen.ch/userfiles/file/wonirep.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3556628ce95ca4c9b2debeff2b6a5e6e/pevukifule.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c793fc20eaa---47481082499.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6195da2aa---sogojulizutuxevelalix.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dbc8df35e---43571087144.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7004f170c---33366376313.pdf
    • http://pronobile.de/catalog/file/31670586794.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082804078dc9---paboli.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b4a883cdd1a0ad2a679ff989eb171ff7/jawatolijefalososofugola.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a304f7cce64---wufulurulutixeru.pdf
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/nomaritodoxobazurixiguxi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=homes+for+sale+in+perkasie+pa
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 16792 bytes
font_01_sfnt_off0000dfbe.bin
14f8be02e10f0d1cfd554c4770ab20e74a1bd2c30a0185c8dcc706206060455b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 10504 bytes
font_02_sfnt_off0000f782.bin
9178377b602313f628c8a63aff2f6e2dafd4bc16227b6e4830f29551191d1592
pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 16544 bytes