Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf7ffb5da86a7fd…

MALICIOUS

PDF

96.6 KB Created: 2021-07-19 12:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b1f17ae8ac1aa17887dc1e36d4ebf1ca SHA-1: d86e63414be69e2ac329bdeb86ee60114685f829 SHA-256: ebf7ffb5da86a7fd4aa79f5067553b383cea013786aac1b9908019e3041582ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6838dc78e---favoju.pdf In PDF document text
    • http://jandenzobv.com/image_uploads/file/28583553492.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/40193473842.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5e7876a1---jelarijiredo.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/17603935865.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/75470499162.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/feje0eot47hh19er2eu493qvem/81691362155.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0006c351288816ad8e05d62b50787ed1/62505517879.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b62a23e09a0---vanuwogabunazakizikazajam.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/86256587162.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787ffde4386---21996559638.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cc85ad94---mojekazozigudejesodeviwur.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f0e5a4f0cffda1ee58e71355610eba88/51276408797.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/sorezefov.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c8d21f04---getesikodev.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/sekupovulonalisesigag.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/74510449344.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gekobepopexexofibupe.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/jezozibo.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xabitogorus.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/10098429135.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720ef175c91---nekenumuku.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/mufizodededan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sims+freeplay+unlimited+simoleons+and+lpPDF 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_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 17628 bytes
SHA-256: c6e06046bfaf0cd1e5bd6482b8f007baf657311a4fd08e5f1b75f0d614ffacd6
font_01_sfnt_off00012c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B2 10948 bytes
SHA-256: 9c41fe90dce764b7d0d4235d9761db65f438c9f221c6b0a870bea90635030533
font_03_sfnt_off00015e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E07 16428 bytes
SHA-256: 23191a20989a09959b2cbcbcedb805b598ca26499a9d836ac043174a76a4ddba

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