Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b4135ae97c9d05…

MALICIOUS

PDF

88.1 KB Created: 2021-06-10 09:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 21242d1df788d63fa8c2286d97cfc1b9 SHA-1: d01805798586cb055e857fbbc010d128b405ce17 SHA-256: 38b4135ae97c9d050eacca543e7dbc9fa228f3faf435d2788bd8fe68cfe1cde1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It leverages a lure of 'matrimonial biodata format for boy' and distributes itself through numerous links hosted on compromised WordPress sites and disposable domains, suggesting a phishing campaign aimed at users seeking such information. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being a downloader or redirector for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=matrimonial+biodata+format+for+boy PDF link annotation
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4t0j634gha0tvvv8vbtifld401/vogofunodunujob.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1d514654c1983562631390028719d605/74315877409.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d01860a7b5e1035f05ab73e5a893c278/48664076833.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/19017846166.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1472884f---28514245348.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/4886222363.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9ekrbu78q8nii7thm1hudbm787/litaledonexe.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/18290546479.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7a1ddbd60---kugiwujosojonemomaku.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/15483868274.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a6128fc0---73090405980.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/bb998d21888acc2eaec3e61ed68509b4/roputipekemoxutuvusefup.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/99f890ecbde45995568aaf8fbd8389ce/84957401623.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/41ugb94nurd5tj7a0ed1mrl6fs/korigorizavanu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/9hi52qfv42vt9q1v66gasb55vn/jelakenizikubagezawiji.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8b435084---sonebasedanotaxase.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a5ea788f4062e270a1f2c1ad54600663/15339292939.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 4792 bytes
SHA-256: 46925c7f2511839f88bb5d81003e260160a50e5532bcf1a4bb639f53b15b7609
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 10988 bytes
SHA-256: 9fd987105c93442cd996e5583b0f1568c030fd7d4eacc22e35a93d31c9a2962b
font_02_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d
font_03_sfnt_off0001352c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_04_sfnt_off0001432c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432C 3780 bytes
SHA-256: e9d16eb6a07990d07db87becd53f6d302cec2d81638eaaa757c33844231ca84d

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