Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4b638cc83a41b9…

MALICIOUS

PDF

83.9 KB Created: 2021-07-01 00:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9b78d4ecba8e1b8090c89bb3dca124e3 SHA-1: 1d506e57dfad35c6fb0a247bdc30d7adec3b0803 SHA-256: 7f4b638cc83a41b987f027ecab859d2dcd706bbc7b494a4d6bf8dbe41f9ccacb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further malware or phishing content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e2f89df2c737772ea4259f9df2be3f95/fuzipibuzibo.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f672fbc4a95abee37bd9f0d7a84ba060/xopipovojazoxe.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0e201ed4ad3562ee766f34aa09b486e0/53963877670.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wemuwexowabogeraxetox.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b7f76e331e36d7eab7d4d0831f775b6e/batewopulipopepekagu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf3144879e---75224782780.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c784f893cb9---jakimitej.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc09c2cd989---fiwafunadedemonodumit.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c5cb25ed7---19860494257.pdfIn PDF document text
    • https://migger.dk/userimages/file/20247628685.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832cea05048---43229605357.pdfIn PDF document text
    • http://www.bash.cl/media/file/molepuzuwepilejabodexemo.pdfIn PDF document text
    • https://dietacud.eu/upload/file/jitilikobebu.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/5829263367.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1676a41efc---negalawetasuxe.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e7733baba5f9f6ca9406b68012c2ab1f/pofufazugoseg.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/manamujubopodipusonog.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/zekifusizumakuramep.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/19239257110.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8eab00dd8f44094ec8295039e0039597/lijivapobajor.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e1ada848ce34980d5bc45c276e331690/47557890873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+difference+between+a+compound+and+a+solutionPDF 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_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 17600 bytes
SHA-256: e3cd12277569e4a9dc5775195ba60ed266fba525141fc57c2390c27a783deedb
font_01_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 11204 bytes
SHA-256: ba609e4bd69ff84cccf48b054606ef9eccb2ec61dd61d5797190e17c771c1063

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