Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fff0bcb0664378…

MALICIOUS

PDF

88.9 KB Created: 2021-09-14 03:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13403b4807fed370f04d3e7f8ef8617f SHA-1: f46c739c95e7916efb4d5476e38d516321dea11f SHA-256: 85fff0bcb06643788158d26c70eb2cf644160e4ca627724339a3410561e49ef3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxupedipevajaz.pdf In PDF document text
    • http://pitin-akutsu.com/js/upload/files/gutilibovawuritosusig.pdfIn PDF document text
    • http://wmsone.com/eimages/file/86288800289.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/ziralijovezi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9c1debc442528d82971d8b64d881ffa5/96026443203.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/mewinika.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1d5994939f53529f44c6c894f36fed64/dujatosorulodup.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/984673a6821946b0ddc93c192cb4e972/72955671076.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/jijitozu.pdfIn PDF document text
    • http://mobil-tech.com/files/23829472688.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/11258901490.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/nopurazarixik.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/mevowokebepulisi.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/47968174413.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/11926877256.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff5ea9c45---18232753143.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/fodopodefezilegewi.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/57046055847.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/zipup.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/damusinulevoburidadopi.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/zijidogido.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/13467685960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=practical+protection+magick+pdfPDF 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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 10888 bytes
SHA-256: 458e59b1d3a3fdc5ede3fc0167dd419a452bf066e14c478ed9c00bff570b8369
font_01_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 19340 bytes
SHA-256: 71c5613fe99901af9bfc6be6f37dc1795d8ecca31caa7727094143deb9c1150e
font_02_sfnt_off00013ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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