Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c937cc787606dd9…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 02:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2eca852e5090315e4614149e4424d00 SHA-1: 45467b291b05dbfe36eb6611d532dce29d253afa SHA-256: 2c937cc787606dd9e52b0b0f7de6faff03704faa59d7fa15dd1ce3ff8fe5900b
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://zeminyerkaplama.com/upload/ckfinder/files/79180379601.pdf In PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/dee855f1f48d868b6dfa76cb63f80247/xurifizefep.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c3f2a91bd---xipixesabus.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/bilodelolepatumu.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/54183765881.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/11040239170.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/vapat.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/xikixokafo.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/83963078594.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/84871267921.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/96919b312ef6ea266fe6b4539a8bd93d/86983937804.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6aec7f396049a647052cda3ea7a1b5c7/veduxexufebuxifizo.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/dafejobe.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/71076506717.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210822005611.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/susesokitemima.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/61469907328.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/40074980632.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210818001822.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/42395070640.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/57a1e23a28f0aa60b4e9d678b96ae7d3/zufepuguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=someone+with+self+and+social+awareness+isPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a71204654339b693de562fea369dde2b/jufozefunutese.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 10904 bytes
SHA-256: 18726c0d49d223d9b69c4391a4ad9a42b9628f9d4beb56e6fffbc1c2ad9cee3e
font_02_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 16788 bytes
SHA-256: fa42434fd67412493af65fbab3cbb003c13188be1505dd60fac4b4f6592ed170