Malicious PDF — malware analysis report

Static analysis result for SHA-256 765ae515cb5e6f60…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 01:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d93742f7a3b7dacaf4723dac9dc59ab SHA-1: 85a17ab20432ad9635ce2ae5a2fa347940c6b1cb SHA-256: 765ae515cb5e6f605bfe78fb5cb0526c70c24f3cc1aed5c4ab215ce10c6d2a95
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it is part of a phishing or malware distribution campaign. The primary function appears to be redirecting users to potentially malicious sites hosted on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=fm62429+datasheet+pdf PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126bf59e15d1---85979470911.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2248354954b5a6ceb78d04aa7e81e292/58553345673.pdfIn PDF document text
    • http://regmac.net/userfiles/files/mufat.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b41bc887368---tatuw.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/zobekipuvenonaxazofeki.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/serabevitul.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6367183f---ximewotunimonex.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161125ceea30c3---45432686407.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc104256ce---rirajenufasaso.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16104d53d8fac0---jiwel.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/narofomiman.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d04deea9---66154251361.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ac4de943---57963617774.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a3080c8f6---12962557786.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/sosasunijozejal.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4db41b4c6---48633577275.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/sodurusoterubazobuwa.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/97328753219.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/23939264884.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609072a7e4d32---jodalinukurababefa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2330be781---63940932679.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/11790301860.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/15606559709.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_off0000cf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 10812 bytes
SHA-256: 24957957a93a881193686edd5f057696048a2e4958da0b81ab0b210da8fcf501
font_01_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 17792 bytes
SHA-256: 730570f63903be5e5682f48134f3f03a00c93081c3fc80d40c4f1e862d54230e

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