Malicious PDF — malware analysis report

Static analysis result for SHA-256 4534bb42eec63bc1…

MALICIOUS

PDF

92.4 KB Created: 2021-08-01 15:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a70cd5b79d71c8c9749de5540a650283 SHA-1: 6d2561adb63137610d4bb96d59152d221652eb19 SHA-256: 4534bb42eec63bc1d37ccd1b92658ab30018469530040cc10c3dd556dfd5e66e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/7nc4fli1pebb4r345toiv1onn9/mitojopizaremedi.pdf In PDF document text
    • http://www.serenissimaservizi.com//files/80399739972.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/233685ab4fb5b86e0110578126e83eae/mamilegivusavu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kixemafidegesubuzixaxo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e29004bc63---gikawumasutusujexojus.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/1468469494.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/15714067172.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/jemokusolulof.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/95933715656.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffa132b9c---jokovebededemanob.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/98584819903.pdfIn PDF document text
    • http://farmina.ru/uploads/files/polivun.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/gawogivogaduwepes.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/55734524747.pdfIn PDF document text
    • http://fxmeat.com/upload/file/8102d7d5340ff263250e80ca9aaf2541.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/rulijedirurinumarixu.pdfIn PDF document text
    • https://questyme.com/userfiles/file/sisate.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/doxowakupulagedojixerak.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/30916567643.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2a4fph9ah42t9pcjmc3hk5ig80/93086013825.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/febagijegekawur.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/40912318004.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608a845b65537---25806771911.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210705130643_m0kze2.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/dezibawebexokasekalipabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=samsung+9kg+washing+machine+top+loader+manualPDF 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_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 11484 bytes
SHA-256: 51f42b9db804374b9b8eb5ad55f4ccc6fcdb1ef0cab9b58c2cc00d666214e378
font_01_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E7 17232 bytes
SHA-256: a9b8e529b4c557174af1bfca5d564c9d82130736e3db7dba0b9e36cb73c30f29

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