Malicious PDF — malware analysis report

Static analysis result for SHA-256 597674dd5bdb26cc…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 11:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38e4e9286d37aa9de80ca0f6d9d2bc0b SHA-1: daf55abb588264173faad1adb2f9a71b15e6f393 SHA-256: 597674dd5bdb26cc3c939b5be1c49d2dc6cf300d652e5b0c4733b1f1627c1169
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135daae3c0bf---22868547482.pdf In PDF document text
    • http://nrgmedia.hu/files/file/fogurazunepitirofama.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/53207102771.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/fujodedalibu.pdfIn PDF document text
    • https://durimawar.com/contents/files/49424745041.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/mibuxezavage.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb266f0232---vegogutedatep.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f649e6f23---41448983611.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/e76ae539e0c005333959fe9ad94a70bd/febizupunevozat.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/02bc8082c59277f8be4830b0730f4351/50097707738.pdfIn PDF document text
    • https://krossi.ru/images/content/files/93209063551.pdfIn PDF document text
    • https://fultoys.com/userfiles/jitovif.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/96346143584.pdfIn PDF document text
    • https://granitnet.hu/editor_up/85980248652.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/13/luxoxunuzupujujab.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/zomubavufaxeluwube.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16150e1742101c---vazenisafudokefofaxoj.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/98043287522.pdfIn PDF document text
    • https://alpinashop.bg/files/bajazona.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/25821822022.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/76962134743.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/16593801422.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/jefit.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/55714351616.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///rokev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=captain+america+civil+war+tamil+dubbed+moviePDF 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_off0000b550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB550 15932 bytes
SHA-256: 14eae31b1a40829e5b859f2a5adffd1e70d8bc9151fd7465da115909c120fffd
font_01_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 10928 bytes
SHA-256: f851b5b48cb6f992f6485088e26c3310f51237be40aa786f4314eacc00352918
font_02_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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