Malicious PDF — malware analysis report

Static analysis result for SHA-256 9721171d0c22b75c…

MALICIOUS

PDF

106.0 KB Created: 2021-09-04 08:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6441136fe1e2a76e1c4f586d69f13264 SHA-1: da28b1fa8323b85b74f2a0c123672f4f94f83a93 SHA-256: 9721171d0c22b75c493f0168071ac2ce45d0e26f8dae549f55781e99fabb9ad4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and the 'link farm' heuristic suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/8fnikh9rhj54q5vqrqvoqq35mm/65375631457.pdf In PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210531_4CA57EC917ED7E0D.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/witubozefiwejuwe.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/zenerubexusuxepodemu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3c646db17---21020844785.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d046855e0---wegaboderesukubapovodop.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9894b62669---9800256432.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wovigunuwi.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/96057121810.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/suzarekopujinanotilotufal.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/terigajodexamuwubibakago.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/wigevilirazoluxu.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/nezujelupolekiva.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/difubakuzituxilirabexaj.pdfIn PDF document text
    • http://rld-carbon.ru/file/87146265899.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bb9a96b032ec470e9e1d258f95a96a2c/46028997655.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/gexizisemesotusidumaxe.pdfIn PDF document text
    • http://jaatkinson.com/userimages/tanizasibewokolorit.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b16cf83388b---95499846069.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/xamumigixuvef.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e6d2c5577d97512efcf10f5106825b2e/biwula.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///vubareravetafoji.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae35379d9f8---30407922273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=open+eyed+meditation+book+pdf+free+downloadPDF 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_off00013414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 19832 bytes
SHA-256: 53a5fe20711bfb63b739bcc52b398c0f7dc20820d6accc0c5e90405ea4d57175
font_01_sfnt_off00016864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16864 10948 bytes
SHA-256: 8c71bd005abf8eab23df06b899ba876db6ad8b9646edbd2e288e938d85106cb7
font_02_sfnt_off0001819c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1819C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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