Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72e567be13a0898…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 17:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1522ca326235451b3926c6dc4d70c585 SHA-1: 0e8075e1000a5f712df1978f76c0ed3448a4883a SHA-256: f72e567be13a0898b57836595fab99992d798db35fbbed3853bd352f092efeaa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cortopolis.ar/userfiles/file/kujufovupira.pdf In PDF document text
    • http://ciccioinpentola.com/userfiles/files/50706824243.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac3f03eef---sogagisidiv.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/15dbad3e1bec57a78bcb41dd67ad93f6/kugejawomajamokun.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/vewokosarigalovexi.pdfIn PDF document text
    • http://klefmarken.se/upload/file/22271895368.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/derida.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/tedobajux.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/42193351521.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/sasemekavita.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160838033591ea---1333896058.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/91111866372.pdfIn PDF document text
    • http://patroha.hu/file/78665389336.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd96e7e184---60565236564.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868d6cbaa00---69980095338.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/34400031237.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/57942226756.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/19195d3f4565eb6c58ea8eca9008010f/44721871796.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca5554bae9ef416f09eff0e56ecfc7c6/mapidegiwazubeso.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/gomeburimibonupafoginu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d492d6fa0---ruvewu.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/36138591009.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/favebimilesedex.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/89946637323.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/dd8a6e47d1b821d49a7e0f012c6c7f30/pasev.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7c8d2437b5b95dd25eb745ca435710f8/60190208367.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/wovove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=marketing+management+textbook+pdfPDF 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_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 10956 bytes
SHA-256: 5379d76be4b1f157b57dbd250a8a4d7f5a96b9ee99df24fb27a4d4c41b7704c8
font_01_sfnt_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A63 16956 bytes
SHA-256: 3efd2026659cb847d7fecf8a57601597844be60a8a7ddd3c6f429687b4fb6577

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