Malicious PDF — malware analysis report

Static analysis result for SHA-256 233478f7b0b31a96…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 16:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3e735005b5837ce1e1d12892e5d347f SHA-1: 22433451808619e4a2c899e52e9c2234a8d861e9 SHA-256: 233478f7b0b31a9667c327ec702ebd3ba40e3ceef6b6213ea9e0c0f630c9b7e0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to lead users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links implies potential for JavaScript execution or exploitation of PDF vulnerabilities to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ttccid.com/userfiles/file/gapozorotaxetusekoj.pdf In PDF document text
    • https://casabresciani.it/uploads/file/14675086985.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/29059843397.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/beseg.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e412ee86---96488833782.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5405c0fa---damotoxem.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ddb0f417b---4856755784.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/subhaqg5b4drs87jeh1bdfk8tu/14299879427.pdfIn PDF document text
    • https://projetovm.com/uploads/files/55848712897.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/38276176273.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ee744be796a4ae33529162a02ac7a689/98235257979.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/28503128945.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/6851fqsuopjrkesnn89dm5gvpb/9081605185.pdfIn PDF document text
    • http://nature-revive.org/files/file/nonawosiwo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/90b6bc423b5d3d24b475e65cebbbc175/9754830264.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/legalosinusimilaviloxin.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/tuwijipowoma.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0866e64f0---76591227870.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-30/20210730032728771664.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0013f982f1---jasonozefafonamutoka.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/vuxapiru.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/dexikofezoru.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/pidejulijafuzisuzorudobe.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/18836374828.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021081208545673499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=op+gupta+objective+metallurgy+pdf+free+downloadPDF 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_off0000be05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE05 17252 bytes
SHA-256: e58f7b92525b613d03f268c64239f630208c645b9977c8e3b7a6e4e9ea36e7b7
font_01_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 11456 bytes
SHA-256: 099ed1c9a9669685797ef45b614b6dc4a2e64e4d48a790a6efc4fb1f76dd76ff
font_02_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1