Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54f75b3d4efcb0c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 08:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed350260dd2c988fc7daa50519a707a0 SHA-1: 7abec300b2a64f957afed0ede2fc9d4c9ba5f689 SHA-256: b54f75b3d4efcb0c4979e052274bf5ea2816e374282ad86db4e1ac4b90523d3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting, likely intended to lure users into clicking malicious links. The presence of these links and the overall structure suggest an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c22d372c7---48737687793.pdf In PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/xepenefiwunubatil.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210720_160511.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/29881226326.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/83686147370.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb70eddede4c574b64611f21dfec7856/kunujilefubovoxibupepemik.pdfIn PDF document text
    • https://luminex.pl/upload/file/jetaxilikezika.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/24535830274.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb93abdb4ec---pubovonu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/435bbc0f545d56340df147476db14b8c/dajogokuto.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/51179061092.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/bapazejamedumalodiguzez.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160887c2d91a4b---55183827931.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26c7720fe5---vebawapumepeduki.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/kolexazubitevogifodan.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe7ee5d8ed---44511105444.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/s5umq33tii7n2icnq79q8kv6l6/71779009817.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/rijopoteneru.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/suwodezawuderuw.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2bd77447---misusoresudefigepozuten.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/2766585599.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c431e3f32b8---51869317318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sonos+playbar+service+manualPDF 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_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 16968 bytes
SHA-256: 3dce068318bbb107b73a49c68e5fa1a4692b802b2e333d6872335e1b35b0ea43
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 10932 bytes
SHA-256: 778957e3d7e11f2ded9c0d524b000c48822ef791f7b97b23aa0a560fbbcf779f

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