Malicious PDF — malware analysis report

Static analysis result for SHA-256 580c6b9b2a0c1baf…

MALICIOUS

PDF

75.0 KB Created: 2021-07-10 00:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f3a020e8e59bc6fabbfe9be96bbb90b0 SHA-1: 03e1df60325fc28045a7ff9f97790efa28384d40 SHA-256: 580c6b9b2a0c1baf9c2a6e2030643957775117192b463318e22eb01e9e557192
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=sample+letter+of+non+renewal+of+contract PDF link annotation
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae046e6bcf---26660497349.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae98d33df32---wobelop.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/ludiritedunaxalere.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31efe32f18---63432778966.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/veliruxutudebe.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/phn91f12f8qbfo4k6p83hpc1j5/18068768825.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/wepefufamuwijomi.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9760a1af35fa7ac408b3edc8803e5674/wolod.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/65771941204.pdfIn PDF document text
    • http://charivne.info/images/file/kekez.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986ff20a0ce---74688132737.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mo7vcd4oupltv283vql74ntkl4/sajijivexe.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea520e14a1---losot.pdfIn PDF document text
    • http://jngf.cn/files/file/tipeguxuneledapojeki.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/59643688352.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/64094354652.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20469d6ca---43236102513.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3672c406---62358159725.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/50c26bc92ca8f5278960c8467fb72233/bulusumasamidivime.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da0ec0e345---13016530816.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58E 15944 bytes
SHA-256: c90c089889911d4105e5c21f43dafc74a33cfad3e68d8e0287616f6ddc93b16d
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 10540 bytes
SHA-256: 4daf8c48001ac35f6fc9458d31579b716414f0dcf874578c8716212c2c813860
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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