Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d3a6fb6716066b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 03:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49f2fd0d4a6d05495a80cb9db3e5ce81 SHA-1: c9b75ccac944c58a6b33557e72bfb783fca61841 SHA-256: 28d3a6fb6716066b5e083070e2a0284822eb5186129f574e32dd0c425d17ce94
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://drafthe.ru/uplcv?utm_term=fts+2020+ios PDF link annotation
    • https://foodexgida.com/uploads/files/55328408221.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/tononevogitunutugeni.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140c85ecaa9c---34548983835.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/sadinuxenowemejuwodixa.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1c7a8691edfa8ecb7c450bb2d98d473c/93840585644.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/78365582820.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/gowepibagetivelupetemi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431c2cbd54b---berabivugawa.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/joragijizepujitixogab.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/woxozebevi.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/29815174319.pdfIn PDF document text
    • https://pellevah.com/upload/files/gitakujiwemabuxexobuxiti.pdfIn PDF document text
    • http://simoncaulkin.com/images/tisudunupirude.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/lubig.pdfIn PDF document text
    • https://yasacompany.com/upload/files/desaxadi.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/42731512645.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/nisozepu.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/fupizifedafi.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/59345497168.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109102359416030.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/36237761836.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b96c270f---mudaxorebenotiro.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/73338065702.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/wilir.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/76777732251.pdfIn PDF document text
    • http://thegioioto.store/upload/files/9242595711.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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 9776 bytes
SHA-256: d42693691dd9868c3c03f7eceaa33fc23405ca52748aeba176db6c60e17b9908
font_01_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 21012 bytes
SHA-256: 1cecce0aea46957e25bb6c7095125fcada415b7820ff0ed8f245b5f4f5e1882e
font_02_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1