Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8780ff098e4be4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 01:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: effc509d736e683379f4b5abdb94ae39 SHA-1: a2778bf2cb22f7bf95b03374b4fc8a84b0456d20 SHA-256: 3a8780ff098e4be426175357ee8c8fad115e61cea7f3a3e533605e7c00512a2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://goldmustang.ru/files/files/33546412295.pdf In PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210916003134.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/galusidap.pdfIn PDF document text
    • https://csodamalom.hu/files/files/47753877789.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/jozomeninerug.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/jobesufa.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/86641997509.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/24607602749.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c197fefe---40681213966.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31af987be---gofumunuwedov.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/51747011603.pdfIn PDF document text
    • http://kyea.org/imageuploads/wiwitulu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcbd34879e---zuwalomapesuxegemenus.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/98320209776.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/75073488060.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/sajegejataf.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/wipuridogaworibisifo.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/42490888246.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/49813054006.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/8493190087.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/57976954813.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/23212633653.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/91970304025.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/35722769459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=zombie+shooter+sigma+mod+apkPDF 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_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 18236 bytes
SHA-256: 22ecd47e44fc9b4cd0a22cc953e49341483bf905927e733cb9f788c34edcad48
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 10884 bytes
SHA-256: a7e25540044e799b7669b231da60e657a1f919ae4aa93b77d12ef0bfd9de4734
font_02_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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