Malicious PDF — malware analysis report

Static analysis result for SHA-256 9adcc020e67d37a5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 20:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 704dad1fc390352dc31117055565e137 SHA-1: 0c671f25202655e69e295b9370b1ee78e21401aa SHA-256: 9adcc020e67d37a53d671d54cf6465020c88362df7f1b1f29cebddce697a3864
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a spearphishing attachment used to deliver a malicious payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=gta+5+oppressor+mk2 PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ad560cafc---4059946426.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/77776566276.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/59089475519.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/zunuvuriboturuwop.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/84032709806.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/40277145253.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210921072535.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6d60f2bee---2338603690.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/85190267352.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/gewudibukebilun.pdfIn PDF document text
    • https://clubon.top/uploads/files/dilixubodivurapisapexog.pdfIn PDF document text
    • http://envigest.cz/upload/file/16688445362.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/61329247293.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/16021934708.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/mifegilunevujenaxunip.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/39016452481.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/pojeguvukomiperafezowet.pdfIn PDF document text
    • http://tochalco.com/uploads/files/wososuv.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/golawiluxunekeki.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/butego.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/bikisobug.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/11014846912.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/41759946799.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/lanepave.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf060090f---95988219396.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109040901372287.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/43722611309.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_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 10556 bytes
SHA-256: c91139ceae0fc8dfdc28c58fd85798ce28a86f78e1c5aa9716f5709ba2287938
font_01_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 19692 bytes
SHA-256: 4031a805644f3985acdb8f8588a6d340f7b8139340ac652fb7ec54b684f5c0ea
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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