Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f88ffb7e034bce…

MALICIOUS

PDF

113.3 KB Created: 2021-07-10 04:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0e3c5c2ad450eae9bdb91d763c90db0c SHA-1: b10ec1492ed4b3a2dd3b58148dc367ccb7b68c2d SHA-256: e3f88ffb7e034bcea3fb51d3242903b67947b22144e8d05d40b9bfcebb07ff94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or further stages of infection. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://southtours.com/wp-content/plugins/super-forms/uploads/php/files/haavhic4uftn2c1vhqij1lk427/fotepijedajotozabo.pdf In PDF document text
    • https://digireg.se/upload/zigefutog.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/22865754096.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc03d343bcc---fesozugabuzibidefugotaz.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/71681743674.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e3856a8e---nufuwupewujetevedevevefu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ed0ff379c---62379736313.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/gejularikibamutavi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9c0d0a64bf928fb528cb66c91c17be02/kiwesavetebezonebotulas.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/22f64743429547177a594a6fc94cd023/37383600597.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/hbtpv6u35im6vvpjosf03v9d40/24844618275.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/74294647689.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/24830403981.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090896d48dce---xezurovuf.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baecfc899ff---75064560189.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/84269406356.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851843c6860---lejusafidiporem.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/33511915348.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/50f3a4d93bf28725de5d52650a31e3b2/noforositalukikukipefav.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d649b4cca3---44218238919.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/18409086246.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/36583083451.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/67913557302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=physical+characteristics+of+halogensPDF 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_off0001515e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16975 10728 bytes
SHA-256: f8bcfd01c94a8c2adca35f70df72fdbdf9988c556bcef648e1c5af8b4df9cda0
font_02_sfnt_off00018218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18218 20644 bytes
SHA-256: 7be40673e821c8e5968af296755020814d7918fbd0d1eab8c4723d55162f0e4a

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