Malicious PDF — malware analysis report

Static analysis result for SHA-256 64620c919cd444f2…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 07:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a91d084c4982dced0d03cad0e2ed6ecb SHA-1: 0ea6745f34d176b91524706d22dc49dac92ada61 SHA-256: 64620c919cd444f21e5331bd7e0d4ef9991a3c45d49772fa8d2107de5e146f56
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://keralatemples.info/ckfinder/userfiles/files/38858978115.pdf In PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pijumivel.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tadanedu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613630602bde2---69889224397.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5119926ec21b9d2302493aec571e4879/vaborudivojafusuxogijaza.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614256e50c88c---kusixigenekufasapomi.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/92182701670.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/20997470750.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/dumatorifikasowesiwiler.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109010953487773.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sobozamaxi.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210908_6EA1041E13498103.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0c4b9029---70688179357.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rnc2e1v0gng2bu2q5lop141sbs/xazijefawofokugi.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/nijavuzadikifoxe.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/90953259269.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/josugadewaxudutazeka.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/galexoxiwofegaj.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/91568118264.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/25628687738.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/lizetadozumotinesupolabun.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/77039326210.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/wupasaj.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/63121144419.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/soxiv.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d03c1b1a9d740ea5b36b1374a10151fb/56981586032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=read+the+battle+of+the+labyrinth+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_off0000b582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 14584 bytes
SHA-256: 3d69d83c4d9c2443f0c44a801d0e26e74beffc29bb57f680a3b86cbc7655e0c3
font_02_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 10584 bytes
SHA-256: 8864df165dbdf58706b4ff01eab2a61610a00ff5d9f364c761a3a5aea45df930