Malicious PDF — malware analysis report

Static analysis result for SHA-256 12945eace076e2b9…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 07:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 023bc9e6befbf719de8e19ed2ec8fc98 SHA-1: 7e67824eca923601d7388925cfa2d635c6c8fb9f SHA-256: 12945eace076e2b996ee7812b26c6c9b82c094898b247ea4689b1780f5e047a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs, including those hosted on compromised CMS uploads and disposable hosting, suggest an attempt to redirect users to malicious sites. The `utm_term` parameter in one URL indicates a potential phishing lure related to free messaging apps.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=messenger+text+and+video+chat+for+free+app+download PDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f202f6ba32241a4b89d5cfc708996290/43573036423.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/81855446757.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16139f88cb2435---22912077261.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/23721941138.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea1c95854---95897894351.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/fojopemokexivijalojo.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-27/images/files/71220376852.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3e704f2c0f85fafa5bb01f8cb7a5ffe5/sawugenuwoxikalik.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/dedumagodigana.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/kivuketulaj.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/sasutuzezajipapi.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/29611438784.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/fukolajujofe.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/78119788835.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/debununada.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/11981928986.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/66598104097.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5643fb72d166c985590071593d799f5b/lagasubutef.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/bitetozofin.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/38197133101.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408906551cb---91591036679.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/37577123818.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_off0000b029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB029 11144 bytes
SHA-256: a5e12b095e8e5f8ae9c3bbedf879827b3b735f4580ef14e745963854d18d8d70
font_01_sfnt_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 17208 bytes
SHA-256: a1af1af48a92f411ae88aafc6752d1eb6377fc235b350ffb4f543d7a01de2941