Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e51fc29a8eab2c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 15:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a70293932c4d4a5b5ac129465ec162bf SHA-1: 95082adfb127461894aaa44b31edef89f2f66ce8 SHA-256: 91e51fc29a8eab2cdb16201fd5d7ae8889c256fc57874b250720b050f166c55a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The primary goal appears to be redirecting users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3255ab8p088ceink53fvam7uj/48676816949.pdf In PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/paxadutiweguwuvo.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/tovibujegufisapitupaw.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c97ed2604ee40ff83e39eafb6c74eb0b/wararuze.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/69734347157.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8abd889c1---xewusafeduvunuxuv.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c147337f56d---gigexiwivo.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/8dbchurh3dmhbnhj88qnd4qcrl/xipeguparedim.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tapojateru.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/54556220553.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806270147cc---denukarijixigubo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/82197023220.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0578d9b396---veruvuxobuzafelof.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/lulifelakedinemone.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/64092940175.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/cfa477c59489cdca6b67a9314f71af86/30791722285.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098665058602---zuxoz.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/33281150241.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/54248aa360f51cc382a58cab8e8a2994/dinofivoju.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/76953588804.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/64703958428.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/5imndm2gjbu89fc8hf1jfjchjb/revufosukukap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=2015+volkswagen+jetta+manual+bookPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB787 11204 bytes
SHA-256: ab2c02d83e5e97ceb7896caeeb56cb018aa8296bfbc716941fa1fd6a8f13dc57
font_01_sfnt_off0000d1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16164 bytes
SHA-256: 7813301a123207b8a4ff669d3b099340d82b434b2fd0a0823406e7ebd67db978

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