Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4230e4929551026…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 02:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4741aa0f90b7709ad6184e4f9d923b52 SHA-1: 99a233057a9c6d5c3fd720161c4d3f0bfd5227c8 SHA-256: c4230e49295510268962319055f12f09f9a31c4970f2444ae097d445c46e05a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external PDFs hosted on compromised websites, indicating a link farm attack pattern. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, but the presence of external links points to a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://culfordequestriancentre.org/UserFiles/file/sunevusezafitisebevuv.pdf In PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/47302442317.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368bf6bc98b---rufojejenametovokijexadil.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/rupimo.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/tovexedagi.pdfIn PDF document text
    • http://www.grifin.sk/files/jovoxiwiwiledazex.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/pogemaluzajoz.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305389203424.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kogemexabejerejitaji.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/34413185998.pdfIn PDF document text
    • https://mikludava.lt/images/files/66980096843.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/14681679096.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/498a86a78eeaecd8283b689361ef681b/55106180902.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/82102391006.pdfIn PDF document text
    • http://kmsenior.org/file/files/66005692161.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/78623931077.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/12192798971.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/ximizanulowugiwef.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/15225335192.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c6179e72---60431566073.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/josogef.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/tejadokefonatomotal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mulan+2020+movie+onlinePDF 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_off0000d27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27B 18312 bytes
SHA-256: da9c80cc1ea96bb65979fbd794e26e9504ada2be05a496e5ee7f5ed0bc5e268b
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 10304 bytes
SHA-256: a18a375e03b3e669cc5131ed8a64b5446f1e081174fe0ca798bc1e71e11ae6b6
font_02_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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