Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a64baa3ea418fdf…

MALICIOUS

PDF

84.2 KB Created: 2021-08-24 21:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d16e1494969b9dddaf5718b43d452b7 SHA-1: 327e5b8f82e52ca38f713479541d6d803d4eff96 SHA-256: 4a64baa3ea418fdfcaac19bc6b60b4c0f712c4cf4cdf4086069077be7ac7ab6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://laborke.ru/uplcv?utm_term=66+hits+ifr PDF link annotation
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3929daf5de---vevasurago.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/33d0c63956389b119d567639fc22bdcc/57114801522.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/firolugosopenepusovi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/eec0044b1a0029601237c2254cad5a12/26667843284.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/25722006303.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2ab127ae5---dokuvegonikut.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/rbttkl7e7cg8ph58i8fm8flf0u/6802585352.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/26488195511.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/mefogafilafomodobiwetataf.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xepijuwoxobewelo.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/79840830114.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/84510473905.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/91905405622.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/gemexujofakulekowuxexu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e64344a07---48038328608.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/mezezumo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fcdcee6ad---butogek.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/nimejabatepabewuxaxip.pdfIn PDF document text
    • https://dafelia.com/files/63971191277.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/vakerev.pdfIn PDF document text
    • 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_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 9816 bytes
SHA-256: 58a97a983072ddf428685cd7dac9b747217adb1755370e620e32fd8adcbd4568
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 17360 bytes
SHA-256: 97a13db9e29d89396a75149c85588fc73f87e46efda1e25421fbae7da69aa759
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1