Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4afc93bd6fa250…

MALICIOUS

PDF

101.7 KB Created: 2021-09-03 23:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4248e4b16f01075529feb9484e0238e7 SHA-1: a4d40675ae6c93140267bd817d14e3235d85a68e SHA-256: 3b4afc93bd6fa25045cc110a7861ebf34ddd3b6b7ff54cceaa60541c1166827f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://cgpreceptor.com/ckfinder/userfiles/files/najewipagepofavo.pdf In PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/1014003002.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbf8092b5---dikuziziworid.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/32568989859.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/nowazefiwutedadagap.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/fivepoxoxujapi.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/62728751139.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/gilimonevewigogazovexi.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/tjeiedv9ul6oqet31k1uk707bq/37707979086.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/tonuwopudol.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1610fad8cc88cc---66822590776.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/bewifiwuwizavadika.pdfIn PDF document text
    • http://chieucoingason.vn/files/87033059382.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/51690391199.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d072f7728cb---gobekadipuxajuxijamafup.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/43767244481.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/sevefigizevefoluv.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/kinigojepatenemu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fbb66e5ef---50542714517.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/59962450939.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/44989455708.pdfIn PDF document text
    • http://usateatop.com/_upload/files/73007881018.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/gasabetek.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/r55h37a1t60raifso7vl2gk5u8/19255304182.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p1odiqj0j1tcc820pihun1ue1s/kubofajuxeket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=galactic+civilizations+3+intrigue+manualPDF 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_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F78 11008 bytes
SHA-256: 4e47c218543129ce2d7e34d74f709c8c098bcb28948b2ea07f2bc8c35f2b3552
font_02_sfnt_off00015933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15933 18392 bytes
SHA-256: 43c2e29fcd8ecd102aff84431655de6c6b74d334c840a17b9178dac739e1c1f2

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