Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c30c399f9e74580…

MALICIOUS

PDF

124.1 KB Created: 2021-09-23 15:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f85b862788c6d9de8007be695e9013c2 SHA-1: 93026de919f496cde76056f735eb43f93f274266 SHA-256: 5c30c399f9e745804628e278cbf954edc4895154f3766e678554815358cf98a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to various compromised or unknown domains, some of which host PDF files. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cursosadistanciayonline.com/medios/files/fugurepixexodamuzez.pdf In PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/60511431157.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/xaparikabirodadufikomedo.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/3665446467.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/blrlq2ljgv0bt4u6evumggv8n3/45603782778.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/gaberuzajozu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbd51e16f---55240407024.pdfIn PDF document text
    • https://rafautama.com/uploads/file/bevupigafijivujunal.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///20308524600.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/24828661020.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210920_035247.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/85334357727.pdfIn PDF document text
    • http://firsatpin.com/calisma2/files/uploads/rabatefemufemojidikakuwin.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/bomegipinafawazumob.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/31350468876.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4023589e00e55c8cf617368632ae5a8a/pixug.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/zobotitijafitutu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b01b9bfaa---47668145477.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/614c6bab73827.pdfIn PDF document text
    • http://air-con.ru/upload/files/11800571456.pdfIn PDF document text
    • https://kimcert.org/E/file/42484140728.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/xitefogitaxikisusame.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b13c23db---67219104892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ultraman+fighting+evolution+3+ps2+rom+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B31 20364 bytes
SHA-256: 37a2c30c34286e1516d1b8491165a98864bb7214b5e4828898e499f7a726bb45
font_01_sfnt_off0001af4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C762 11496 bytes
SHA-256: 359bfd3624383154726709383009917b3e4d1320e9d7ef1107e714419e900207

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