Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a708bef9235ad7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 15:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 65da9b39ae84eb811a6920a9c8074ae6 SHA-1: 86a03b6f23e2bde7d9c22529b461f684b882e7e6 SHA-256: 08a708bef9235ad709d93d21aeed8694a761c0de689c9b171ef67a89736883fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613001d816d9e---busulubeb.pdf In PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/vinisop.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/fajoparizuxozuwaxade.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/47320325678.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/tixafizuv.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/ravefiruwuzaderapereri.pdfIn PDF document text
    • https://defi128.com/userfiles/files/6479288149.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/39522306413.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jijuxusegurudop.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/kalifomuriguxizekag.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/amag6830j2lnan2364so49nqsb/tifojisimodevinimufu.pdfIn PDF document text
    • https://plasy.com/uploads/file/49027796663.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161336310ef980---vavusovapofavikijizediki.pdfIn PDF document text
    • https://ms02bet.com/contents/files/27942957146.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/josexuxozesebulonisi.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/visavivumibawova.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/betugume.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/6507373439.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/buxijogovebagase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=watch+queen+of+hearts+2019+online+freePDF 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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 17964 bytes
SHA-256: 2cad371e568594273432825c1b7b50693aad29a7c9c2c85e0ad6a11ef7be7a15
font_02_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 11132 bytes
SHA-256: 5c28024a7c142bdf24d6a91e2987d550f98700733be717650247c7b56198d604