Malicious PDF — malware analysis report

Static analysis result for SHA-256 529812214b8dcb56…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 12:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcc465e174b705f4f833cc0efd189364 SHA-1: 19a07ff8ac35fc54569347f765e7635a7de4b086 SHA-256: 529812214b8dcb56b366b18db4897a08fa8885fca6e837f472a6f4b5d0dd3c19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic findings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072abdf31715---31145679605.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/65d1a58f7bdd58e6a6b35966a2c947f2/75182226678.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/9825242833.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e28fa5f70---rageso.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a707f93b9ab---pifuzowerijizunos.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/widonenugizobo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075faa13e22e---gikopubakidafowenupofu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/77261723683.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077575ad18e4---96852298925.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/52449837558.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5130372ac1---ziroginolub.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/96603655883.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3acb8d494---ridakasabanegu.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/metatezexadi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/puvofasirubowokisizama.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/60077237510.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/37436399097.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/83508653898.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/76983799377.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mjn6b40v78ijfcp1l22djvt71h/bedozekipekozofewetu.pdfIn PDF document text
    • http://classtool.info/upload/files/vuvamamururibudubekapiz.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/dijosetawesenunojunikag.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ribafalubodususajuvepobos.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/adf6c895f7a9c5da5d47a50279cefb49/susotebabenilile.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tutanipesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+calculate+acceleration+when+given+mass+and+forcePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/45f4d3e504fa7a032fdb77ba1c1c9a61/tolul.pdfIn PDF document text
    • 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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 17556 bytes
SHA-256: d41808d937d4864d22013d555aaec0780bfad1063ec48fda6193cbb5056291c4
font_02_sfnt_off00012832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 11164 bytes
SHA-256: 11dd1266fcd0cea7f86b14623ade608d2001e96544437e391474e59d0e4f8afe