Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e52b706283abf1…

MALICIOUS

PDF

101.9 KB Created: 2021-08-12 18:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73f60c103d4bc28c6dbe1869fe64305b SHA-1: 9902b2745eb2a4ec6d2206c04b4f6341939ae3cd SHA-256: c3e52b706283abf13f4def181fdd3ccf7a8585e27c2fd3088639743f38430fc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the latter identifying it as Pdf.Phishing.Trojan. Although no scripts were explicitly extracted, the nature of the link farm and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://otczenacts.com/media/files/97042085371.pdf In PDF document text
    • http://turnyras.lt/Files/file/jumepeduruzof.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/40206203554.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/46ad1a5f6a5434aee4d3549cfc7f606f/zereb.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/98f6c9ed0b726359856b3f3dbb81841c/26879299896.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/55ee7a1411031b6aa2c4cd064a13b834/javakasipivexi.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/jipovufazupawozatefovutij.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1902860c2d---tuzugotafaval.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/gawupomesofap.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85d2624b2---74904291869.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/velerawov.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4fa051d25---zozejapodosefafaxitafuso.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/jovewokomoferodilozora.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102fada87e08---49013239547.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77ca27aea5---damig.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21bd0a2921---kixoz.pdfIn PDF document text
    • https://iwistw.com/upload/files/91250246085.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078adf05736a---bimumadi.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/18928431091.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ff813d375a0aa3942243fc2f3e5d07a3/vegozenadawenawuf.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cdefc65d3---dasulumefa.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/sarobovavezubi.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/20f0f4a7665d06c3a2f3ed439bbebe25/sujofu.pdfIn PDF document text
    • https://baptistfriends.org/media/95042352039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=new+headway+beginner+student%27s+book+fourth+edition+pdf+gratisPDF 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_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13734 11276 bytes
SHA-256: cde8978e5678a3aec74c0fcdc1452c4f2848320d29bfb722da6caf67bdb048b3
font_02_sfnt_off0001514e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514E 22252 bytes
SHA-256: cc6a8c6d0ec0e560dd27de7f44f77482dbe455de835aed4da69b256b6618e048