Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e750edea50ead3c…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 13:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 27174c3a9880b2a432a7423351dedf6d SHA-1: 14c8865da8a95386e584cd292e07d77ca068ddf8 SHA-256: 4e750edea50ead3c5169262c5b7579568138462dfb2fe97ce4d49742aaf8f7d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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, pointing to multiple compromised WordPress sites and other domains, likely to distribute phishing content or manipulate search engine results. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/upgdt36qmb2v0nor8i2tsis623/sutawirigirexazitujus.pdf In PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/dac3aad21d42622b38c334cf398612ea/negasovule.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e8665cfa22ea688948e5055628d6c804/zafaxixawuze.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b808702543e---mewofelojumakodikigaxa.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/42991918447.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/47110434047.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/269b9bcac31834c187cd22f71d37e899/92273698863.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/cb73h04b4tv1vg27ncbsuo8v6v/11171358186.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ubo9mlf7pgd6kj761bfik7i9f1/vuserelijikosamefesiwata.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zotirexu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/656dc5086750f9935d1b9d18acde81cc/61140505030.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/170il1k8cnp97p30nmmlk5c3h2/bimukaj.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/66656162371.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fc8eda811ab4660b05152bbd38d61d5d/fexotisagolizes.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/gopoda.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/40618ee17a652797023db470d5397ac9/kebuvu.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/19816628412.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/givugedobonize.pdfIn PDF document text
    • https://anfauglir.com/images/file/banikegorol.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/10716179604.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a75b2a75ce---78701577088.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/i339nab09nr54i7it4k763i8tf/17341411769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=candy+loneliness+quotes+with+page+numbersPDF 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_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 17644 bytes
SHA-256: 28359f0001a2c87fce9a3e66d0c39f3cd72c9ea797621d4fc0f6efdb5d0889be
font_01_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 11456 bytes
SHA-256: 72c0fc9e56d47ee8d9407ce295f737efe2902dccdbb8ce6918cdd7a08109f415
font_02_sfnt_off000134ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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