Malicious PDF — malware analysis report

Static analysis result for SHA-256 893c4b9de0f4ffa9…

MALICIOUS

PDF

82.6 KB Created: 2021-08-15 14:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8fa55302537951a2c2a11554f3cf2c50 SHA-1: cc7f201630c2d60e9fcdf3c9fc2fe5c42c872567 SHA-256: 893c4b9de0f4ffa9d09b7fc7c3a2ab576a6d2a974fc42d6e469fdb6f65a61221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://krisoc.ru/uplcv?utm_term=free+math+worksheets+for+grade+4-+patterns PDF link annotation
    • http://96rangjai.com/userfiles/file/gizonapufesizekodorof.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160998dfb4016f---gomexesi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01993e072---59141533831.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/diduzoxulegemazisawonuxaj.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/venepegalepokum.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/pujewifazisojasalinajiren.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/549d1b45f8c079fae5361e2451176c98/wojonamituxu.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/zolaziwowilazefewir.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/60723290288.pdfIn PDF document text
    • http://fitviewer.biz/files/file/20763039393.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/78727549127.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/liwijutabiwuzurirupozopoj.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/o5lp3un4rf7h9pgjdgpmrmcnkg/96039672678.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/51hfuadtcghud2scsulo6sufn0/ludezugitawinejijesod.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d53015572d---mimolabowaguxoxawobezareg.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f424821093---zajozipupejirumobu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/t0v97h1nhdhgaja1skg0cruhot/joreluburofox.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/40625901430.pdfIn PDF document text
    • https://menu2uplus.com/images/file/5145548839.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf4136961---junejigivozajidofujivev.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/15656121246.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/nimiruxosuvi.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/082232b96669533a2017b88cbc90aab3/32776510964.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/dusekububefa.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_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 11076 bytes
SHA-256: 860c79f8c25c00960b152cbc5078e5303739070130f96afded702ea01f56354a
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 16436 bytes
SHA-256: 86b2aed8bf71aff2bb4df57104e1bb557f57a8b76c562369770172cfadffd2d0
font_02_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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