Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9adccd1b785d52…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 13:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88c00f9bfc4df8d423fdbffc9ed7b1bc SHA-1: cbea9f1cfe1f530319d999dd146a3ebfb6805c88 SHA-256: 7e9adccd1b785d527268f2fd710f1d386e491e00e01fee62606881b0aae8b733
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous URLs were extracted, many pointing to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=download+dead+by+daylight+mobile PDF link annotation
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/dotuvepiwimenovo.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/jexolis.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/tapepakopegasivawew.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/20968998643.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/lagit.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/zexupekumazo.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/xizokuzagewoxado.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ac4bf9c99caf0b822b524944d37978d1/96527710729.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/40582286761.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/buvoxevufupebirigega.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/8132176487.pdfIn PDF document text
    • https://filetorme.com/upload/files/90832043991.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/8723925547.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/31287915027.pdfIn PDF document text
    • https://somogyplusz.hu/files/71159142706.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a5c6eb268---60409547822.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/ravuvubuduwawam.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/45670190786.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/40049990111.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/49973664621.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0af24b649---7159600112.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/wonebulufebipelas.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/kutozitelotokuxinaki.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_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 17216 bytes
SHA-256: 9b42b58286bc2408da1eeeda1d2e3355165e89c7c23bce1806fba1b780188502
font_01_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 10768 bytes
SHA-256: 47f8cd897c287d53d709cca445f252d76a6fb0f3ff81e9d46b37601ba4920c50
font_02_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1