Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebc664923705a35…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 21:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d177cf55dbc83dea4d08c4f2f7a7b085 SHA-1: 8786f7a103fc781aab879c631e0c28d7892feb64 SHA-256: 8ebc664923705a3554a7f6f7eeacda8000348372f6102ae2db3386849f131121
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b6f8b12d---67615003026.pdf In PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/0b87fa5159a25f10d34096166f93fdc6/64258822152.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qd4bccfjdnhob69936g0qav4n2/vonupaz.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/javozasamu.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/45361416331.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/bivugolezirepubutilewe.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dc69c1baa---42238126924.pdfIn PDF document text
    • http://cobmedia.hu/include/51195458705.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/d673ks8i4s2s2e8ji3uagg1lj1/kiguvemejajofebadomolo.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/308965182530cc9581ebae3249a81773/25208159625.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/pakopumitopewofuv.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/18220919357.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fea0cc881dc---tigerevaxebifebupegorev.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161172635cc320---29184018311.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e98794297bf8bf8b52876a69bc8ccdb7/zidaroxozopoxolabapuvuxo.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/rijakisidonapelodizower.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/96283997414.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161199406afad8---radaligejapofexawol.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/rajuzuzawapatijuwewo.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/moxawuxosoza.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084ccd640857---xidom.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/totuzomutenuxomudozuz.pdfIn PDF document text
    • https://hssanesteban.cl/files/fitezeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=oster+bm-1+bread+maker+manualPDF 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_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 10640 bytes
SHA-256: 8f8f06b7c9e741293ceb95b2eaaac830efa2d6df4545f605fef5064f62df2e0a
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 19388 bytes
SHA-256: b80cfcc5ea4920f0147a723b4e60777a0ae419cac2f0a0dece3e591396869665
font_02_sfnt_off0001365a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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