Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d52a20ff18e187a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 09:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f324d105638e04b846aad8208074f395 SHA-1: 2f554483e90561daf35744b919fe5f914d8707a0 SHA-256: 4d52a20ff18e187a230d6c79aa9b8a553352f07c262ba3b8ecdfb9dd568c702f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

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://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddfaedca95---32763091750.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d3magea4qsla49igclokid99h2/28627683730.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a490492e2---73815870320.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/pulen.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/9901406509.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o7r4dpsrnddbdpi24v77vnvd0j/mebewolurododudu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160843620b6c2c---vevegasagof.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748c6aeb373---jenisaruwamafuvodazeparit.pdfIn PDF document text
    • https://landi-bg.com/images/file/40636305517.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7475f6fba302ca47174c751dc638b7d2/24992647612.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pozegoketarotukidon.pdfIn PDF document text
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/gepufivexa.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085860dc7d7c---70293788741.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7cbbd1ab89d869e5d5ceca9a722e553b/27567169240.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/mexeso.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/refomagut.pdfIn PDF document text
    • https://fototipia.hu/files/files/1011869083.pdfIn PDF document text
    • http://exosushi.com/uploads/files/jazazimone.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/99124921503.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bfbb941ac---gamok.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/zobugadagudelunamidigafe.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/kafidivadimovinik.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/40945495856.pdfIn PDF document text
    • http://mextro.de/upload/files/17578846961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+put+a+box+around+text+in+wordPDF 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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 10592 bytes
SHA-256: e80352db3d6b882ce6bdb06c35bcd07e18fc53c2941a58fb7749228626f51ae2
font_01_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 17612 bytes
SHA-256: edb1835f94b80bf840794bc61b4bed07f6892db9970674dec86ae0ee6c967790
font_02_sfnt_off000126dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1