Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e90afb875af8819…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 21:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d322d52c988b38e536226a843a0899a0 SHA-1: 0a075b37d406b30bd855a9baba152911f2d75431 SHA-256: 7e90afb875af881968da480136c252abcd81311e0e76cda688164d5d9ff44f54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains a link farm pointing to various PDF files hosted on compromised websites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a spearphishing attachment attack, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa447b848---konejonaritesemomune.pdf In PDF document text
    • https://bmw-zona.ru/uploads/file/nexudinuv.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/dd280a7ts4qg8thsk2uu9e52mu/92699108920.pdfIn PDF document text
    • http://tulga.ru/editor/files/40607866046.pdfIn PDF document text
    • http://digifast.cz/userfiles/wujovipetagad.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/40165081302.pdfIn PDF document text
    • https://datajournonepal.org/files/94145527401.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef6be53ce---sasavobodovutikiliv.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/60507993616.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c5b861ed---64854613998.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d236542231---11814299595.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/69146317374.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/72143485673.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/metozemaweboxusekovoxiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60d86c2096---725797017.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/70755614844.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a475a7ddf4ae2dee8538f561ebe3035e/bikuvexikogelugupat.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/galozemilesedevusikape.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/lekenotezuxusovorudegifut.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/kfjhvab4rqtpou74dpm2vaqnl2/18647616723.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6ac559d4---toxakizim.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/79649948196.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/9959189775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=it+2105.9+instructionsPDF 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

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_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10596 bytes
SHA-256: ebd30bf6b45a9a3ca94cf411b1e818e990230cb46692cde7afd86cd72115158f
font_01_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 17740 bytes
SHA-256: f47d19ef2ba5421d72fb8f4fc7a1a7451e360bbc9f5f0e73f2000dc832effcf8
font_02_sfnt_off00013f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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