Malicious PDF — malware analysis report

Static analysis result for SHA-256 0057ef801e20fa29…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 18:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f420fa080baf95e4044f14c61881158 SHA-1: 46007f9d04892d676a89c7b4d3ab4ddbfd80a303 SHA-256: 0057ef801e20fa29855fc403cc05271e48bd56f022a192553f27d99a65bd897e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://damsindia.org/admin/uploads/file/8292984359.pdf In PDF document text
    • https://refakatci.net/userfiles/file/fexizivazov.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce1200dac---jazuleta.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/xeronobetegulor.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/xuxavas.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1b6c801e9358769242d60998c48c4fe7/buwagi.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/76758259648.pdfIn PDF document text
    • https://clickbox.ro/images/file/77725751611.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/97766059744.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/bituwuzikokusexuxiluxu.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/20303357060.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/nowanidonezidebuwas.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/89678729725.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/kozegitosuvopoloto.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/jipuwul.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/feribifosetureze.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/zawarigafoganuluvopor.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/livinuvipunawijerujim.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/vexosobagesis.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/95052428305.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6f8f43cd34c3e4c93ff2a2f5de88bf4b/jumurizuxinumumisadide.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/29545005120.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109011552485826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=voice+changer+with+effects+mod+apkPDF 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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 17980 bytes
SHA-256: 1cfd55f3a536de323a45d29a38ba0ab10cde5b28f1f74b38bbb1842baa7ae128
font_01_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADD 11168 bytes
SHA-256: fec536e60d3e5aa5b7acd4384ced3d4f9f41b615052928d58bc09c6947443989