Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a9470670b1cd9a…

MALICIOUS

PDF

79.6 KB Created: 2021-07-13 20:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: faf6248256b7baf8a6efc770fb3f8643 SHA-1: 0b5714e3923842fd47e756c638abea56f6e008f9 SHA-256: 73a9470670b1cd9a7046aface6ba01c94b36b7d183b168ea90f8d9707ffe0a17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/04f4c2aa9b0f68255d9ed367da898e3c/pesenerurifukorelopazuz.pdf In PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cff7807f---baxafudivufedamon.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///gurunudet.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/52182498991.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///lizuzusuk.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/pidebubigasagok.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/fagosuwikuzurogikasa.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/runomikurukafanapiras.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c652ebac5---69676391389.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/57410791841.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/12421385219.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/gujujugawulo.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/baworajupapazave.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/29190439699.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215151214246254.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8b8960c56f8202b0f47b99b6a5af7ffe/negiganoxaxajukatipe.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95534892895.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b27955f8---torakerinodisujumurira.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570e24f1ba---35218911991.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/rufajiwedewugu.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/30753297755.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/pafujezotasubafuluwad.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a190054c8c1---98038485068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=english+synonyms+and+contraryPDF 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_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 10780 bytes
SHA-256: 3b5d5b7d71c927f7b9ef29c1b44055a13bf7276e03c904991dbf5a7032953ae6
font_01_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 17796 bytes
SHA-256: 21b806ede056e1a71af79af3337765a1606e6ea8a8009cbd01e0871570799420
font_02_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 2304 bytes
SHA-256: f2695e3f945e7a13360ab2962c68ae8c7d001ae2960f5de13064e10b3f2b5cb6
font_03_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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