Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc026e68ea64bec3…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 16:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a6a3a49d5b01a5d34dc7b1397cf942c6 SHA-1: 31db363ab3fccf3f9b8cdb9e574444a51b767399 SHA-256: fc026e68ea64bec33714379c4ba6b8ab3f71fce5a3c4956a0d26461d4efa2fc9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with multiple URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of numerous external URIs and the link farm structure suggest the document's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1b6c801e9358769242d60998c48c4fe7/buwagi.pdf In PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/lejikix.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/2016220303.pdfIn PDF document text
    • http://rhondachem.com/d/files/83227758589.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/22615004461.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/77865537913.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/88650980144.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/murolodatulexuwutulesijaw.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/83512299330.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/kuratanuxoz.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/korobepupegolufibazepida.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-27/20210927163550268718.pdfIn PDF document text
    • http://guowangcable.com/d/files/duxosugosisuxu.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/18796862742.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce0a33b84---mazizumazadi.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/garalijaxamalovo.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/gowotafadapomevusedotipor.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132b1f5ebc08---surer.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/sokemiba.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/41462053098.pdfIn PDF document text
    • https://beaszemin.com/files/17859922767.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/55935005651.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/donoromifedono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=weathering+with+you+full+movie+eng+sub+watch+freePDF link annotation
    • 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_off0000ade2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE2 11284 bytes
SHA-256: dd23b60ad83889f5dddda852acdb845a4dc61c91423cbbafa93908956b69c907
font_01_sfnt_off0000c851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 14300 bytes
SHA-256: e828ff4c98f53c921615e20e1d88dec92475d143f59204eab305c6ae76a2bcc7