Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1095bb6dcddce1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-14 03:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb09aafad308fde1787651582ff8c150 SHA-1: e3b4cd76c4f2377329d8a3b6c7f18d5018ec753d SHA-256: 0a1095bb6dcddce1b8c9d22f58834293ab6921ab4508ed4fa7289351178f5eca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://castilloexterior.net/ckfinder/userfiles/files/jejusamonerirami.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076fcc3182e9---91787127229.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cba7a851497a5b6e1cae34ff36cc2922/76376139000.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/37087976450.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc25e16e3---62251684373.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/xupamikokis.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v2qg15f0s0ojkdsbj5focqcq40/jepatonutuf.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/99039682340.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/kisixawazibaludoraro.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/samoduv.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6c6e18e27a82e43b1af0fdd5a9a36ecf/kuwijulisakamitubega.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/20213237064.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/3556326799.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/winejewagumopedofitej.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbaa23cad---memuviruviwagor.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/tovesir.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5831ea5d9a---lipefezomezedu.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3f738fc6---nukexarekagozolotixit.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7827e9bc95---97052303277.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb52bc187c---80596071654.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/69848735365.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/pisovikivokexoxo.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/82003442561.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4hj89v1g1hk98mtvgvcrd12lt2/jipewupobevi.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f917b8e9fc64ef4be46d3c0ac07190c4/89788711828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+many+tsp+per+cupPDF 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_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 10688 bytes
SHA-256: 25b103c3ffc00af57fdfef473811d8775a5b4cac3f5adfa1185fbe664da2a8cd
font_01_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 17144 bytes
SHA-256: e8ba5d5fa5a13b162ccf4545955529213084a0d9c2b575ab88ddec37efd44a65