Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a8cdae23daf56b…

MALICIOUS

PDF

95.3 KB Created: 2021-07-08 06:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18c000b6c8b2726ddd29b91a5844c23c SHA-1: afa0c2683e36e5a19dd904410f4e35c081259d43 SHA-256: e7a8cdae23daf56b4ae154f571fa2347095c2ef9e21478164909ca62f5469b45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload directories, which in turn redirect to other malicious URLs. This suggests the primary purpose is to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nomylo.ru/uplcv?utm_term=blue+reef+fish+%26+chips
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814ec3b3efa---65341047819.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8ed5111a0cd17948c455add6ce012413/bomavirojenusuxe.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/26b5737a718aaa0376cab850f8efd2ef/virijowid.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160792f3a2712f---xajibedemezubi.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3ff78a3b2---bakegogatib.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/v0sf0ki180dpust5en5d6pds8l/28643773136.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9fd6d0845e020b0372b65700d7755cac/malomefunakasip.pdf
    • http://adria-ex.com/images/blog//file/fodovupu.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8f1352d9---bixetumibazutelogarujuv.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf11ba0dc2---1498062797.pdf
    • http://szao-spb.ru/images/news/file/mesubogerejilekenot.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab7f0bca5---11651289395.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d84f81e43ee---jajusaka.pdf
    • http://chothuexehochiminh.com/userfiles/file/30809740672.pdf
    • http://scottsdalehighbeavers1978.com/clients/80197/File/39894813700.pdf
    • https://steammining.com/userfiles/file/xijiwo.pdf
    • http://bmcnx.com/userfiles/file/serinoxajepugixezavija.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/96983025567.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838cb9bca9e---simitixakiwoxelexipa.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/48670c6efca0f0a6f45958a3dddc2332/guzifisopilifevefote.pdf
    • http://bmsorganica.com/userfiles/file/88459604130.pdf
    • https://fruzsiflame.hu/userfiles/file/fajalunozebukow.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6dfc8bf2a44f908920ccfa1717d51574/gufotogi.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5943f5de8b---45282841918.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114fe.bin
2273ce3e5ba97a5a45e2568f537db7a945549a59a301a99b03ef2668dd61d054
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 9980 bytes
font_01_sfnt_off00012b31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 16792 bytes
font_02_sfnt_off00014343.bin
4e4284fd29b0bbb773ba9b098e985d9bb568e1982130e335c032518e760d8714
pdf-font-stream PDF embedded font (sfnt) at offset 0x14343 16696 bytes