Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbb1e2f92e7ebd6…

MALICIOUS

PDF

78.3 KB Created: 2021-09-21 07:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1db22ec444f0347ffb06e08db3ff4ae8 SHA-1: f9a2f85f9438735247556704bca8caef1bb48ddd SHA-256: ddbb1e2f92e7ebd6a7bd3b58bdf930fb4f7d6162e7928d9d3d104bfa75d19ed8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristic firings strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=galaxy+betting+tips+apk PDF link annotation
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/xiwivutisamuguw.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/63219652649.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/21982815308.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/8564248892.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210905_1D3B7E65FBC7C573.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/33759279158.pdfIn PDF document text
    • http://uhorder.com/upload/files/88376038849.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/505d4348caea6e2e6ce849d66f8b0434/40372321525.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9bb17ccdccfe95d0f757c3f7bdc89930/bijozukirupetufomafodaxut.pdfIn PDF document text
    • http://canoeing.by/pics/files/80569890721.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/jomozufimimeb.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/55880715339.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/subifunijunofexafiga.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/51244823162.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/zinebis.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/nezuposawoxexuwoso.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/golebabebumovixaj.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/3501030350.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/mosaxekuvewerimixejumerem.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/67104137154.pdfIn PDF document text
    • http://domario.ru/userfiles/file/fesorupitefupexano.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cea64a2b---fogewi.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/dinisozovubok.pdfIn PDF document text
    • http://nscenter.cn/upload/files/73816686265.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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 17324 bytes
SHA-256: c4c2943df1a461d1b939f7573dbb3191ec9ed61005ee26b3ab60eb91f447495e
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 10696 bytes
SHA-256: bb5c89a171c84345734c7af4b0c2f0d10eae6b53e654300655e70bb51f2e1a52
font_02_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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