Malicious PDF — malware analysis report

Static analysis result for SHA-256 1053b8ee419d8da1…

MALICIOUS

PDF

86.0 KB Created: 2021-08-22 03:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 14ff361b85d7f7b2ffccf8370bb976e3 SHA-1: abc34f317f30f4317c246523811c62647d5fef8b SHA-256: 1053b8ee419d8da121d3bd35e73e40f38d13166cdc0acc7a6bf7e1f9e52e38d8
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://galerie-louise.be/userfiles/files/74556417849.pdf In PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/98931153018.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/pokogitefivugupav.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/jinuditukisuvuxiz.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/kadib.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2e8b7bbfe88099a7de907b52ae2e4a4f/1685375658.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/24582653762.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/81134573867.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160960c397017f---momoneweburog.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/eq5ggcqjbpincgfmbnpvh3jho6/43927855519.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/882b947b027068bb7c75bfc0e44836c9/besovivodobedorese.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/wigidinagul.pdfIn PDF document text
    • http://wenxuezj.com/images/File/5786922009.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4d24c416a940885690d864a435e46fd1/dugaxevaxutefaki.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/61593807383.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/rumevivitubakudadaforemis.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e945966b611---gigibigonuzazobifop.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/kowudixid.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/power.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070600351370554.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/36009996986.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c8eb987089c651b66be9d084ae9173bd/disuvupe.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5075969855683d88959d3fb891cc5aed/41416608415.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/9018377393.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/nenijukuvesodifubogozifa.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/13092312188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=do+twisted+teas+have+glutenPDF 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_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 20572 bytes
SHA-256: 99544c3a381f2bc4f4b379f60465dfd4386ecea15b83b05f380c05e64f794531
font_01_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13107 10680 bytes
SHA-256: 86bcbb3802d7670a24185f1ef0689e7d3cb84ed06bd773a8baf5f0cda820ecd0