Malicious PDF — malware analysis report

Static analysis result for SHA-256 443af2bc97258570…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 05:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4c77104c7635366e35ae616b7579dc6b SHA-1: edada3f7cebb56da8e63cbe0f93f7f9275be4f52 SHA-256: 443af2bc972585701e3018ac645c32ae2fed9fe6f215e12ad4738e029035a29e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing an embedded JavaScript stream and multiple external URIs. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, likely to obscure the final malicious destination. The embedded JavaScript is a common technique for executing malicious code or redirecting users, supporting the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=lamour+app+hack+version+download PDF link annotation
    • https://apoiotelecom.com/imagens/img_fckeditor/file/728432679.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/10852342732.pdfIn PDF document text
    • https://jck.ro/userfiles/file/kozevajebelewufefo.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/60100553788.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/dabugutemasidel.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/50615709190.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/51229197947.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/nizokufiw.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/wojawimavabewege.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/kejunoruxiguxasev.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/tegorosa.pdfIn PDF document text
    • https://venus-forever.com/image/files/20616381364.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3ccb2eec6---40291013362.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/48518908731.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5da90uoqkb63gfan99cnq98sis/12875017466.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ae3b3bd8---3724338227.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/10140895573.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/nulokawefinopagunajupiv.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/jodupukupur.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/64782743641.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142a9a80be41---bajakaz.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/99356499539.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_off0000acb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB8 16060 bytes
SHA-256: 1cb0164c6ff706e3d3fc660d5dccdd69e1f08315a47a43acacb0cf452d3551f7
font_01_sfnt_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 10984 bytes
SHA-256: 805a295d2a9f0c6340d6d6bf0ea8e71af76bd519a7e4d8ba0894cf09e961d48d

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