Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15df5b3df7d8b60…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 08:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e18b639a8c7dc54d8ab9dc9dd04b0053 SHA-1: 15212139a0de8a06e2b84fa80786e40c4a1d460b SHA-256: a15df5b3df7d8b6097f1cccecef8e9899b03a8d6661260e924e2472cb924fd81
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The heuristics indicate the PDF acts as a link farm, directing users to multiple compromised WordPress upload directories. This behavior, coupled with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c66a4c17036---42198805314.pdf In PDF document text
    • https://dietacud.eu/upload/file/xogaz.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/7299364713.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/13852933680.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909322c9428---60590747024.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0efd2150---tixipaxaz.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3e811ecfd9f07e8479c2e4ce6b304366/gosadekifumuremopit.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d316a61a7c---92120844135.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1174f29149a2369614b5cc90f6ac3649/fumitek.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ugohkaqvnk7cvr9kgn1l7pcrgt/84506491686.pdfIn PDF document text
    • https://iword.de/userfiles/file/48527215721.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b23aa51ab4c---gakuxix.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/gimara.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210622153648.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/63cdfff4df7eafd265d1ef99914220a6/25296689148.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd8352ee2---resufimimepazuzapuno.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42818360a4---karagiw.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0e2cca31---gewezokubekefaxawabofi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6c47ff03---68429454022.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7990aa95---jamenamoredekovojoga.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ca81b679054ddf9fdf235595a05501e1/48388403066.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/kenemusuze.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/kixetotegobema.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/riwojowinugoxuxazozapufa.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/binedodadon.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608145389e3e2---giseliku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hamstring+warm+up+exercisesPDF 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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 10828 bytes
SHA-256: 054a957ee21c47877db8d37af9db058673f166576202676eec4c95518f9240ad
font_01_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16600 bytes
SHA-256: 7833e38ed0be8d71c65d5576fbdcbf5e39d532e5672663c1a3f6a30dd8cf03ae

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