Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d567ddafe68d0e3…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 21:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76624833c1a42c5f84e2612b6acd6bbc SHA-1: 9ae369b4445b8615ca13a731d3f9b0e9e34d0ac3 SHA-256: 9d567ddafe68d0e393748544287aa3f5da6308110ff4965561e305fe65605104
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or credential harvesting attempt, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a408ed54689---23566565644.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079245ae89cc---44826625962.pdf
    • http://pescepiana.eu/userfiles/files/lomepipu.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dadcb1926a---86936805421.pdf
    • http://bienbao.org/uploads/files/xigikixur.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/vt87ig6go4t25el9pkrjp9ii1q/gavotovuxenipaxem.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c014ca6221029fc1f5b54d0201f7eeb7/ruluzirodejiwobarazafiba.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8d452f1f---34808827406.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a113f25cf---gitozemuponerudom.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/41794488384.pdf
    • http://slsnn.ru/content/files/26245187825.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862de7e02bd---17062952600.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/f277d9b8eb88ab968785b582ca57ecf1/waditozinon.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a82ef39f3---dinarowufa.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1887faa5129c229ab59582c7d78cae6e/2865719643.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/99068056209.pdf
    • https://puppometalli.eu/file/75216137231.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/h5pb8a8ldf4590gtv1neckp1tr/duzule.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3419e4ba45bf6fa5d731e6aab89bb5d7/wotupalibajumo.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085235f8edb3---20823821552.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/44515944986.pdf
    • https://ottenburger.com/userfiles/file/86350762070.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab76b0a23---mupefofewevi.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/173fddcdc5d0f64ef81b92471807ae95/kipoxawobaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gravimetric+determination+of+chloride+as+silver+chloride
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 16792 bytes
font_01_sfnt_off0001076b.bin
77ba207de38a425278790ee3122009c26928cf235a384190d3c593be23b7d86d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 17268 bytes
font_02_sfnt_off00013484.bin
4d0be9593ae615b62784f1a10eee74bbc5dd2b2b7843625ca1361fe177d1c049
pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 10848 bytes