Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ec34f99e7604f1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 17:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3af489ef3be9a5a1199db6ddf982a69 SHA-1: 908951bdc258b9b049c0080c14e439cae887980e SHA-256: 45ec34f99e7604f15488ff1d3a45a736ddd34f1b05f06e8aec2ce3245624bf61
156 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 WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://advantage.ee/media/contents/file/gezuwifotilexonu.pdf In PDF document text
    • http://czernavendeghaz.hu/admin1/file/86742912574.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/judogadilupenekobug.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/sujasavu.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/72933147983.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613509446a408---15552210498.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4fglak7j57kgu1kft27cq41q3o/koxuse.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/xudowijiladelebazuxokefu.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/kedik.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/okqda9uhe5l0qs0qn6oqirhbv6/79020163872.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/99073610985.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/65397d1a4b83a09959f3c94eb7342ba3/nogabuxofesupova.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/vutuzenolozuwawewuxoxanej.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/92221443098.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/23033805251.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/varasilepejebo.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/kudilodusosafisoweki.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/vaxokir.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/xinazuzasatefofazusiremu.pdfIn PDF document text
    • https://inks.bg/userfiles/file/83703920580.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/71343089004.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/27989992195.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/bepadalafusobixiwuvas.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/kesevaradajenike.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/godiraneditewixubokusoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=boolean+expression+simplification+rulesPDF 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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 10896 bytes
SHA-256: 330a267d29b981c627d116fdc57884147e13813b552859a9045bbce757945699
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 18200 bytes
SHA-256: 3b63abcb011549b66f2bca97bb1f405c9977ddb0504fbf5fb06db110fdd2f4ee
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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