Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3ef9472b30475e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-03 18:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d52ad7efbeafb8935468b79dd1c7cae4 SHA-1: 74aeb32eeef15e7ee4a197bb2806b52c46b184af SHA-256: fa3ef9472b30475ef0a4b32bd83650a9ffef3660b686b14dc6b18960f84634fc
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=unified+soil+classification+system+pdf PDF link annotation
    • http://veganogle.es/uploads/ckfinder/files/mebuvowisusediwatiza.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/16546909104.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4c73e10616ce212f0d567331a1a30db6/remobanarokesuvixup.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b6042075---likakivenilijeropog.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/17082919154.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0d55100d6---58925149589.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/31888185861.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6ffg0gdkq4ki7uvgq1va8cjf30/xixidosofolekega.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c330abc0cd7---73992828116.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/nujera.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/31787737889.pdfIn PDF document text
    • https://termofriz.rs//files/29186283775.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a247f1b86---kifapuliditenika.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/mimuwobo.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/lefemumiwodewawupum.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/dawoj.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/46211065775.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/zanupedureb.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/558f67d1ee057f2da2d92b8311e59ef4/senive.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a2f62d57469cb920d9cd4f8c2d072f8e/simadiwetadomituridamodu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3qna8np285tdd9cqq83qlnknc9/18261118408.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gjf1524m3egds09gcpi7jjsa81/fabilagaxowofid.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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 10800 bytes
SHA-256: 3a08b7664ea9da97ac03d07182a00ac778b90f150cee8e15c4e8c73f46204af1
font_01_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 16456 bytes
SHA-256: 697b29c99b0f1d3a523406f1d6ea6d01e804a7088b206920746dffaf0f503695

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