Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7599319ba918a7d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 18:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4eb4b8ac2b35022e144d5ce05f549740 SHA-1: 3f6978661a58063794a3e299149e65260168f59a SHA-256: e7599319ba918a7db44bea831ccd262da675a2a98195d66936e0f1a824fe1993
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to various domains, some of which are associated with compromised content management systems or disposable hosting. This suggests the PDF is used to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=responsive+email+html+code PDF link annotation
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98500067929.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/52459961649.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/tilazovafab.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16132abc2da548---49474379432.pdfIn PDF document text
    • https://bor-diing.com/upload/files/sapizufaxego.pdfIn PDF document text
    • http://kisito.com/userfiles/file/faxur.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ffa31c309---batokozumabot.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/tinopifejosilon.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/fefenebuxajemuxuwab.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/gogixigatedesere.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/tiwusifafof.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/974a8ce4fc0e94702ea006f5107a22ca/11857048799.pdfIn PDF document text
    • http://praguetransfer.com/files/file/nawebatuduz.pdfIn PDF document text
    • http://mousike.it/img_ins/files/10743706120.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/90220c194491ac8951844f7343af2668/xezikotozuw.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jomazedobosini.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/26036678678.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb43934ef---jivesijopasexuvaruwiju.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/lufogotilikegozejetuk.pdfIn PDF document text
    • https://led7.ru/file/funexotesajanaj.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210926112056.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/99306955884.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/10432991192.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210920_D6DFA1D86B1C0B0D.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/76982242860.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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 17312 bytes
SHA-256: 1d720b3c1a4c8f9d1e752fb4a382f90600c743716d4ea3eb582532ed7a845681
font_02_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 10788 bytes
SHA-256: 083d2d97f957e9e07cc307f5e1016ce3b94e539f1e32cb118e3c9345c7617668

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