Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de8463523e85c2a…

MALICIOUS

PDF

87.4 KB Created: 2021-07-23 03:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed65c4a871db7f5a025784e763de297b SHA-1: 1b2745dee2c3d684c5423eed68837e28ade3e574 SHA-256: 8de8463523e85c2af0d8f420015f6b6510e7a464989844d492ae1d345f7e781a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites and potentially malicious files, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/44a02f69d5a27ea7d1edce58b2f25598/84921119031.pdf In PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/638234c41b432a84e929a9966c6ea731/nevepolazipiroxevifurew.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b436ce46c2f---81787579209.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/43702680776.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783fed32679---39069763335.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/49019070890.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/bbece9b05451b5161a97eb1b81017cef/fapumopo.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/wakolulutapobe.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a942939ad4d---xuzodugujevekefitelarop.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9ccdb97662762df639a684c6bca6716e/83183316939.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/241f6e700da73295ae4b1a10f083e087/46607517787.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qmaeouvmim4muu978af2ih39oq/guweridanexibixerikoz.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/5384478716.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/95170231062.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1567db1b4---temufinivifunap.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/47b56f3576e3c087528a026fce032276/23900127024.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/77478230593.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724ffe7a346---44080492994.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/sodapipiwob.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/rejexowupudobukagaxutumi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/99agsavqi0tjhmak9t2e1po9qd/pidel.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/satomaruwapijijebunako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+does+star+interview+stand+forPDF 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_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 17244 bytes
SHA-256: f4d6db1d1837e1164e1c4520f77a4e67bcf5a38857ebf3a259951ba6195de652
font_01_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380F 10552 bytes
SHA-256: 71eda87b3b4b0c2df58459326393b967a6032722864646d3ae005692368670f8

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