Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d239d8495c0e46…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 11:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51fb2ce20dade7371f20c7f18f2e5bf8 SHA-1: 57bfcd553181da0667a21521e58b67069e67967d SHA-256: c2d239d8495c0e46ba5aabe152cf9091d4dc4e46f1a6eeca1cc275abbe7b7140
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm directing to numerous unknown URLs, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://n-v-v.dk/userfiles/file/gulapiwevupe.pdf In PDF document text
    • http://jawarakreasi.com/file/69413797563.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///25864156190.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323546a3f53---41186345245.pdfIn PDF document text
    • http://ore-processing.ru/d/files/457038431.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/39816512036.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ab20d5b72096d987f0c1c3e32767871d/91641914659.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36212725086.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/tajoxanofufajabefukat.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/lezeje.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/zaxobofefepusazimu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/juwipopepomezadopexe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161302a4d62e09---puvudebisadu.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109082038567957.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/devazaxujesofuwixeje.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/zifiz.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/91034328733.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319ac1f3865---86380262698.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zezezamulatigadisipe.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/28963203728.pdfIn PDF document text
    • http://asvpp.fr/pdf/mipitesoketowutov.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/gigosubedowusotusuxotod.pdfIn PDF document text
    • http://sergeybazarov.ru/file/sefuwemazubaladizur.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613297e4367de---77156013727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+lock+down+my+child%27s+android+phonePDF 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_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 11096 bytes
SHA-256: 61b642ebf81857e04863c2e5206fb6b7d3d8afa72922cdb7f875972c2b81211d
font_01_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 17696 bytes
SHA-256: 3a3c4a1f38081edf92761224ed3675b66261bd9d1e8c6dac24dc640557151ccb
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1