Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1d2ea84d7f9d1e…

MALICIOUS

PDF

93.8 KB Created: 2021-09-18 11:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e585492e2c8c02924ba5464ef5085a1 SHA-1: 9020fb8dcc160d904e9c181f7b02082c791e0041 SHA-256: 7e1d2ea84d7f9d1e6d7fa6e77739d019484cc56dd8521f01902c7434a12bda3a
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning lure. The embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://baxsporthorses.nl/userfiles/file/20887985297.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/72e45c9f92343a7e10d0053ae9596c1d/1513122847.pdfIn PDF document text
    • http://yepuco.com/uploads/files/83397166574.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/87943903376.pdfIn PDF document text
    • http://gzwep.com/img/file/202198141320.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/13058730034.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/janotefavedej.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83f35dff2---soropu.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/lagiloru.pdfIn PDF document text
    • http://rsst77.ru/upload/files/24192983074.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109011210507001.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/rawereropomalur.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/65361121828.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161458fac31593---29810019316.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091514301762.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613520b9f39d3---78475487037.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/65516984130.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/bozapuzakagoradafoluf.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/73605831552.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/nenamadinixuli.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/46760889583.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/wawujamalev.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/36183367302.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/62525273091.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c0345b47dc2ea11da41c3f162530d956/xapad.pdfIn PDF document text
    • https://adikkedua.com/contents/files/sivisufopivisuboko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+iptv+player+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 10372 bytes
SHA-256: b537ce23bfcb4ae7671c9e9738e50d8c07b79a7e959bb405f3db12b3d3a0daba
font_02_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 18344 bytes
SHA-256: 013a38717f9e6be53792fe56939ad342e4aa2ec409cd6a0114d474bf0c066d94
font_03_sfnt_off00013964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13964 17964 bytes
SHA-256: f6eb1c1371986616202b7f727f8bac326f51e9e2653af6052fc29cf4ae716d2d

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