Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8034e70e130424…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 18:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59d840d00f04f7ce856909e310461c9b SHA-1: 81a4a239e4051637b397906684b6ba19ca4f02d1 SHA-256: 5f8034e70e130424f451ff4f2183abce8f4d0d4a5bb6790d2b3b542545c29252
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The ML classifier strongly supports a malicious classification. The primary attack pattern involves luring users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=itune+playlist+to+android PDF link annotation
    • http://elitk.ru/_files/14240895185.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/5370052150.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/somoxibakuwufib.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/80648456208.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/dovafigiwuzu.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/nupotegobuwalomerova.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/netazegidova.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/76731917918.pdfIn PDF document text
    • http://chenruichem.com/upload/files/deduwu.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/61575459152.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4a563d71---monuxi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7g97o349ml81sgf5b4b6uo5ri6/lopifiso.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/rakapin.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2cb0450de---49855720425.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/solomena.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210913_053229.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/88439232465.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/68555391978.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/78704128453.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/44079361662.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/52481672785.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/gusedaruxowedabikuwajurox.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/29119772691.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/69236677666.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/q0568vbf8umuno1linnprjcmj6/dovobadujazajegokutafoxup.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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10552 bytes
SHA-256: fdb51ee3305b8bca4646349cddeff01ce5337345595a1e142b83e8681d8998cb
font_02_sfnt_off00010ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED8 17420 bytes
SHA-256: f797c4425cbe3cdcc509a3b9044e8e22373cd0621da1d97d78ad3f71edd132de

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