Malicious PDF — malware analysis report

Static analysis result for SHA-256 2194bba5fb999080…

MALICIOUS

PDF

78.1 KB Created: 2021-06-29 19:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a6125c354b54dff1ffb999ef8fef9d3 SHA-1: f4939abd4f8a4c5069f0616354b760e6ada66e0f SHA-256: 2194bba5fb9990805ac39250c188bcbf2ee9b6c9592acf1db05b1159696c6b75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=uptown+chicken+and+waffles
    • http://tourister.kr/userfiles/file/95769933167.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e52d689bb---rebuxanaripe.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/kepiwupiguwejaxilawotefun.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/80854173953.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e342302ed470e79c3de7915e5630c901/maxelemolekuv.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607830d6ec3a5---lezokuxefogog.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ea4aa6aa0---zutexumabunaneb.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6g5bsb0fipicg00c6rbdln6qn2/vufaxavikaguzid.pdf
    • http://cropscipublisher.com/files/upfiles/file/lavajadovelabuk.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ll80rsfpko5uvbt9kvhaj3c6ou/xuxuvenuvedumize.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8539103a6d---kilozujakenumaxalalosaz.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6e918b60745c7dc64489a369b7d94830/xinuxinibaf.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2efdb3699fb230619b6bdb24e92d4e96/90071258738.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/kr0pvitdcnnf2b4d29d21rgkh0/40856182924.pdf
    • http://1hozain.ru/files/userfiles/files/56177751432.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d16cbcfa---bejazogusazip.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1ccc7700288d518d9ef21ced2631aea6/terijelo.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f8fc82c9dbe4478e01ffe76942e1f0fe/paludavuvadogadob.pdf
    • https://olterus.info/contents//files/ritexixef.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/981ed026a751ba245a87fa8f424e4b96/kiravarubofetolexebatu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 16792 bytes
font_01_sfnt_off0000e21f.bin
043f700ab54d6a09fbee3c5735c5e6f218a489ec0bff90b4b4959eb344b410e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 10804 bytes
font_02_sfnt_off0000fb00.bin
b9d633aa200aa625ada8060abfec091a0445dadaffb2fc8ff63d459b04a0c83c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 17932 bytes