Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a710a82ff07479…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 05:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2e425cc8ad9b7cd47eeb43e31e7226cd SHA-1: 6e1bc568be3d648db6398863d99485b22a4a9f3d SHA-256: 38a710a82ff07479b682507fef36b2c1d5ae14e8c5a65c4d7fecaa72b686f1f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and numerous embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lixupeng.com/uploads/files/58815308947.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7beb05a4b6d58b47f125200294cdb3f7/13239052689.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/21735662037.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/biwegotopevodowokir.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/572a0f5652ad9028ccc20756633bf120/4436084437.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/xolufokigesajajijudisixob.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/60827204588.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/86234033149.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/84390943782.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/pejasugefebase.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/jjsbmrki6pdap1jnrkn1blgc4o/wibog.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8df381ab4f51a8bc693f6e0edecd9b9f/23293073765.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/61748069269.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/4892964027.pdfIn PDF document text
    • http://minerva-collection.net/files/files/buxokogutesamojavexewone.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/21415411789.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/loberopil.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/jitotifetugaporipobexo.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/98164075287.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/fitozono.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109090811371564.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/35891906338.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/lenimugaxepug.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pegvgcp8b8dbh1ish8du1dllt0/86183473943.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/40315352215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+transfer+text+messages+from+android+to+iphone+after+setting+upPDF 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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 11180 bytes
SHA-256: 749cd8b157f5f417a23b646670c823152f2e7215a914b6bb0b2ef486e8efc238
font_02_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 17420 bytes
SHA-256: 0377755662f640f013af6a62ceaf27132d404c1b5318afa62b26f47d9abe24c1

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