Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdcca1d2a5146a7…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 08:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 191bf837f20b9261c87418232d2157ee SHA-1: 74475e1240d6b83bdb19c3c452654e9e91a41eb0 SHA-256: 2bdcca1d2a5146a778032cfdfa6f511101929561523b2f51a5d10c6b1226e85a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://amrapalispot.com/userfiles/file/bikarugunawixiv.pdf In PDF document text
    • https://baohohoanglong.com/userfiles/file/pegevezamimukefeme.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426455c5ca9---16780593588.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/liwenusivibovusutat.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210919114933.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/wugekorowogimixe.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210904100759.pdfIn PDF document text
    • https://adci.vn/data/upload/file/wulusasozer.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/48395774192.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/wonuwasalifojof.pdfIn PDF document text
    • http://getvisa.ru/images/File/dezawu.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109171755081321.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9r3s724tj5qfr3sev5dcpd4gi8/91019124431.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141c34417c77---34969216225.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/23354267398.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/45022104608.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/15800920137.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/99343846220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=harry+potter+and+the+sorcerer%27s+stone+stream+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_off0000b790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB790 11024 bytes
SHA-256: 7578065e4293162b87d3485c0fb7e567bec372131dd22aee9d14c039fa821b26
font_01_sfnt_off0000d0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 17460 bytes
SHA-256: a6566fb5a3ba11622458864cd983faa5532e03768060ecf44f022562db5fbdf8