Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cabebc51becb5fb…

MALICIOUS

PDF

94.7 KB Created: 2021-06-28 16:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 524262b1084713fca14593d8455c8b0b SHA-1: 1efcc5d89f1e17bd9d372283e76646728a19b372 SHA-256: 5cabebc51becb5fbe3a70358184abf09495ff68c988cb4a70865da586ce1d038
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, many of which appear to be WordPress installations. The primary purpose seems to be directing users to potentially malicious content or phishing sites, leveraging compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://synerhu.ru/uplcv?utm_term=mother+blood+group+negative PDF link annotation
    • http://computer-rudolstadt.de/upload/file/96763503266.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/xenekejukomi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/795ef1589a774a1cf3cc699db0bcca33/gulutuwovademimon.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0db28e9516175cfa169fc86c893a97f8/bipaxukunupezimela.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4gf629a3l3r8pho17fvoo4h8p4/zefuwapevetaleru.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/lawom.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b3720d972e7616d43f9350dddde76d65/lufarelufupevuvalotipusex.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607764dedd0e9---79586985672.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afec995f286---jetunefegivovef.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/68892883686.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/bc5da6bd0adf69e020b8316fe8ca2e29/ramusugikod.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c261c077---wezijejapeluxug.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/affb7112a725eda8b477056a399c4f7f/tolanaw.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/896004071780e8c30fde707ce1fecf3f/82228815184.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a26b95b7983c16762f97e2cbafdc4783/22198762322.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/18109470830.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/10754813280.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609905ac82057---rokidu.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/jolusujavivafobip.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/paras.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/bexidar.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/mukun.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/visaxefilap.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e8635e031---pikixojo.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_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 17504 bytes
SHA-256: b996fdf18177e529d285050de45aa8628f15500f6afd7e811e36515889f45fe4
font_02_sfnt_off0001539b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539B 10804 bytes
SHA-256: 87399a858201e5de442c30b2419cc0a8032cf2121918dde5e3c4c8593d9bbd7d

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