Malicious PDF — malware analysis report

Static analysis result for SHA-256 390f32e14a197da4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 01:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3b62c660cebf9c167e9e0bcb115d0a9 SHA-1: eebcb433deb4c64582908f0a1f2dd21a2a179a11 SHA-256: 390f32e14a197da418b3d0f3a9c6ea879f2143b18e854f084ba6a5dfb35aaf47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the file being a link farm designed to redirect users to potentially compromised websites, often hosted on disposable domains or using SEO manipulation tactics. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

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://laborke.ru/uplcv?utm_term=yds+%C3%A7%C4%B1km%C4%B1%C5%9F+phrasal+verbs+pdf PDF link annotation
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/tenumamenoma.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/vonanusa.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/79847823957.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/49307814807.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/9978638675.pdfIn PDF document text
    • https://halkum.rs/files/10975931949.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409c936e330---fapewegodu.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/bajek.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/74415075182.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/87890181547.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614263945c208---jusozusofuliwufuwulenunet.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/83380077060.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/zunagurosovipurusudenek.pdfIn PDF document text
    • http://rsentco.com/upload/file/zevatonatipozenereduze.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/30632033539.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109052324198321.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161426629e09ad---52014124660.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63655284414.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/ninuwibilodimojitavovuza.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/vagevijedozigov.pdfIn PDF document text
    • https://bloomeng.com/uploads/pivipokubarowu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c61fbaa85d234bb940182c4d549b4e34/dafogajuwuwu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210906060422.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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 11116 bytes
SHA-256: 03b89fd484cebb7385e7f663acfe0f2f546d57025837fdfb8a8dbc18177af456
font_01_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 18300 bytes
SHA-256: 4dfd198cf9bdc3ea93e90bed512652aa3509640bb355bdb01529dfc04aa844dc