Malicious PDF — malware analysis report

Static analysis result for SHA-256 23300eb3b50bbadd…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 21:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 83ad4e2e2a98c548bb4ef285dbb7fa2e SHA-1: 58829d01a14b69ddd9abdb9e3e19a08f32f8d1d7 SHA-256: 23300eb3b50bbadd0eb1069a39fd6b5cbb09346ec70f038b96461b1595a15b5e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The document body is heavily obfuscated, but the presence of numerous unknown URLs strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j7irm7li7he0t2confp9pmpd5f/fawabifasagigozotor.pdf In PDF document text
    • http://bsinteriordesigner.com/userfiles/files/vorimipoxuxemole.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/jedujavowikadimakokexaj.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/70692266443.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a145b8e0b4f---zojasaravuzonokaxotolu.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/93826689887.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d205bd8c4---muxero.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4be74cd563f0e4254158af0470a21d75/624926601.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/2f4bf545769a672d886a6bef7980955c/50573484524.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d51ae5da2f---rasidugatafixiw.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/55121039975.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/8410224345.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/88410786556.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/koxijakogasovib.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/saveber.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/3c8kitq8kvhs3ut0qa2vng7rob/domudegamimuleba.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c2919418---88973675397.pdfIn PDF document text
    • https://strechybenesov.cz/content/jafijebuperefakopew.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/16529458212.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/43675470907.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09b505ff7---kutukijexekekilawusag.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e58924ccf---85981487439.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/40216d207f11840849b62a6e23b272e7/25175066085.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4357fc2347ac07d7e263f9dc9c7103c4/xezori.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/xufinebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hepsiba+name+meaningPDF 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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 18272 bytes
SHA-256: 93df8882e8214424f6d252c0e587804a5c4ccc120d0d0fb65d3fe29c2d8f6b77
font_01_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 10364 bytes
SHA-256: 3524960c33f50f0f46daa27e479fc76d136c33bc4d3548d74de82baf997436e6
font_02_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1