Malicious PDF — malware analysis report

Static analysis result for SHA-256 b541fa3b6e40a411…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 20:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b26fb3f1b978d86d9879eb975b33225 SHA-1: 90f7ad7595273a8122663df74e391bd42eea172c SHA-256: b541fa3b6e40a41198e9e8720f7c9d227857d3f2675f1ffe26bb7e93847c3113
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download further malicious PDFs from compromised websites. The presence of external URIs and link farms on disposable hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=download+fpdf.php+file PDF link annotation
    • http://blankheich.de/images/uploads/file/dapavijitugavixal.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/85035617154.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a20340105df---13050950665.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee09c17de6---5616652280.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/78990347898.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/wanofetoda.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/3odlctkfbn7ts3koorv7mb6gn1/jomop.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5348e1f9b8---vesigatufanuriranixaned.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/86023711041.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-26/20210726104816347819.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6mrjqccn595ck9ntmhb5o8bsl/21305241026.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/kujebijedap.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/doligazuduwetub.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210831025339.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/zapawoledararanubepa.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/48790351453.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612113d64c8b8---14221011233.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/tewudipemijofobipupaso.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/kimoroko.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/8780214484.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/xijejeloxefikumakepopa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ff819fa99ef86522b60fc4c391139de6/66527047406.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/nitixosonibulif.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-08-16/5d14f3a5c68de9263b2f8573a3a6d6fd.pdfIn PDF document text
    • 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_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 10380 bytes
SHA-256: 7c4102d20e7fd39e59aca9b9a9f49202099ef85191c547fefcc17b589063f9cd
font_02_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 18144 bytes
SHA-256: 68ec1c6f2e336048f6266ff9f618130248c6636eaf870a19d02f382c2c57177a

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