Malicious PDF — malware analysis report

Static analysis result for SHA-256 1515cf1b5df8acda…

MALICIOUS

PDF

84.5 KB Created: 2021-08-18 01:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: a952eb28f50862532ca254d47eef6d12 SHA-1: d74f3b7e26ea8c2ff60e8104d923e18c3a0b525b SHA-256: 1515cf1b5df8acda1c326969c5c63d167d23e0b3c355baac260e1504976ebb13
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrustworthy hosting, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=tamilyogi+2019+isaimini+hd PDF link annotation
    • http://www.parinet.fi/tiedostot/files/11920575534.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/36569411821.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2db6e42e27918cc036ae8e5ebdb386a0/mifikulefugovepokogad.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/fizitogukewefofaxelame.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/wutuwegixu.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/54822216146.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/59644044081.pdfIn PDF document text
    • http://imoroz.by/upload/file/75056140821.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ac5eaf2d---jesovenazupewidawafapel.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/2051863829.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/pewigopepaxulid.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/61253325035.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/fimilupebedekuted.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/47502283663.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608065b3a4943---vupamiko.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/56722204301.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/43336951622.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/v7f9boegep6k958jnlmad1n3ng/5984368345.pdfIn PDF document text
    • http://sdds.be/userfiles/file/20929662989.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/kolopuput.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/kajulimejikoroju.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/h0dtmv545nfbjp9imp8bqdvs6a/wojowadonod.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/voketipogojusudadizulu.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/9108098979.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_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 17048 bytes
SHA-256: 60d0452a2212fd76234d965ac55caaea16a94e641126b2baf2c836e45604de2c
font_02_sfnt_off00012b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B30 10904 bytes
SHA-256: 9491c002f423c5f8db79255a73933c0b2f17d3fb83abaff7e7a108be7c1f62ba