Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8638c9fc46cf82d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-28 04:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69118cae6c27f0df249cc1cdf600f4b7 SHA-1: 2a0b311d7dd24ac6591c3fe7d768ff743e482634 SHA-256: d8638c9fc46cf82d264fe6de9458baa3e9da000458c185c60e1c5ca0b524df2c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The primary attack pattern appears to be directing users to potentially malicious content through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://cesishotel.com/res/wysiwyg/file/49749630523.pdf In PDF document text
    • https://msiutilities.net/documents/54364603549.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/82d929907c3ed1a34d91d49e2379f384/79865675960.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/78017594872.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/13475381161.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/35148324361.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330daeeb0f9---xejexesunexuzidaxezenem.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/webobugijadudosidopofo.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141e41e3efa5---67624885395.pdfIn PDF document text
    • https://xaydungkienthiet.com/upload/files/luvifupitelozujasew.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210924000059.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/93301891865.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/tilezonij.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/logugizozibib.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/13325653613.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/44066463730.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6b7622a4c---nikadeg.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/67641337962.pdfIn PDF document text
    • https://greenways.at/userfiles/file/limupegiwivonega.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/fukujeniwufuzibekuvofu.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/1907592286.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kemuwapit.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/tefudikexukuxiro.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/61580802420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=goodnotes+4+ipad+free+downloadPDF 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_off0000b329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 15780 bytes
SHA-256: 0831382058fd5b2d56875a5213959b9fd1b429cb603dad2ad8694276690e639d
font_01_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 10692 bytes
SHA-256: eb50893f79c60dcfefe37eed1cf6451a4d08ec05c6572d9547d168591045ab98
font_03_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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