Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b27c2f407dd4c1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-01 06:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df041685f746c1cbf7a89012bb9fc85c SHA-1: 913929b3f83ea4dbf4d3700bbcdf467983b73724 SHA-256: 72b27c2f407dd4c1df75cce691796338c74c32e6ed366810fa2d0ee75bb1decc
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body is unreadable, but the heuristic firings and URL analysis confirm the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jolanyee.com/upload/files/202108291104419924.pdf In PDF document text
    • http://cutyoursupport.com/userfiles/file/folulugegasejadibepavef.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077a84f48e---65922553240.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a25c2e3b9dc92ff5164b97aa1d7ace4d/bawusibom.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/28166039980.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0a5358de---80906899234.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3488c36bb7---49077603881.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4q4kdvglis2ktoas7mn6vj2akp/8186756239.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/89776116785.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160731ab8e4af4---85162078707.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/dbe4e672c715bfac968792fd0a04fa51/xurixezufixedeve.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a509cb66a1a---pofijugusijexitag.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/61800312144.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/44592884043.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/tugaboraxonanogomufotiji.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c9803c53e---dipeponejejudanuju.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/xuduwuvebepaxukekuvegokin.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/odl5coi3ou1devllm2nujjvch0/levufilun.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/88043685412.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/90727716259.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/ziwenipuxowajukadoxitatup.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08ff72f37---munivagazowibis.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ht5hcp92vkl1bpubu3j644roq1/27366057622.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/munojepefinenopepuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=largest+cow+in+the+worldPDF 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_off0000bb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1B 16256 bytes
SHA-256: 922d6a0316935b9385e0e7ef38e9ea30701c9640f9813e421b00351b7e8dd81c
font_01_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 10692 bytes
SHA-256: 4d1f7a789b10887a4736968c44cc62ad0ebbe11725f358dc522453508d3091a2
font_02_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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