Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d72bb85ff2c82ee…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 23:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0d099e5056188f52e61f321f6161f8e SHA-1: d95681254fb13e38581f3080f813b4b097f28e87 SHA-256: 6d72bb85ff2c82ee27add89666fd31b885a5a934982ceae656264cc3c693fa34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a large number of external links, many pointing to PDF files hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autohausnschmidt.de/userfiles/file/26457590419.pdf In PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/6851fqsuopjrkesnn89dm5gvpb/9081605185.pdfIn PDF document text
    • http://pvvc.cz/files/zewaratitukiwelitimotoza.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kmc73lfjko0qaehmnaedeq4mdd/92844837324.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/etto5s683n171ff9k4seru8p2h/20352069064.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c940b8e5---62205030398.pdfIn PDF document text
    • http://dominant.name/userfiles/file/fikixa.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/p4shrblkdocvbs4fod1hb2qe7g/70378694236.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f72e7446b---ziretinaxu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160940e71039da---xexodo.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d4f8b7649e396a0e8cdcc2e25b6881c4/33065027285.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/fixugejokuzubunexir.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/gipewafafeseloduzumalezo.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/genufefafudupiziso.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/92953340584.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/3d8p060lpmoreb2k9pnqvqfdcf/65286794714.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/wisip.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b56dd2976e4---nijexamiroluku.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/79958419642.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/26343473322.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bb66f855---murokafuvezupudem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=very+short+declamation+piece+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_off0000c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 17108 bytes
SHA-256: 506ccaacfd7f38253cf139227bf64371ac24dbc11375796729ee2bb687168e44
font_02_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 10968 bytes
SHA-256: c9a84925edc0abd16c5821b0925ca6c093eb110274af112a09b8bdbe53193810

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