Malicious PDF — malware analysis report

Static analysis result for SHA-256 86262f78c820baa5…

MALICIOUS

PDF

106.8 KB Created: 2021-06-29 21:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 686224dce9b8a8799193f5ade70c9985 SHA-1: 3587156911f30f3a1cd237876ec3b86b7b70ebd9 SHA-256: 86262f78c820baa5c59f7c905215550b672f2c43fbcf7e01a2b5aa08d895eff1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=barron%27s+high+frequency+800+words+pdf PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60eede999---luruladosu.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/wejovemalafinu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b05c7e5a4---90976835859.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9edc79b63---64424285058.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ltkv6a305er6g25fsocg8nho7t/51259916429.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160986abb140b0---pezexeraj.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/mepufofexowe.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/xavepugejuwiroguji.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df6607d4e3---kuzupijowenixoxuxajadepi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/tudipoxanibejubivukoriw.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/23oihaf2bjq6ef6f3r37j4jkj1/52331423024.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc9db4eb5---zidiru.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/80946117594.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/51780380537.pdfIn PDF document text
    • http://darec.sk/files/files/gaxelepovaborosesaz.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0411f68d66---kikapisegupuroge.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160987d5f1cfee---mejopukapufetugo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607103989c86b---zaxarapomutepevarusifaka.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/24374945121.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37f74351c---99047348996.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/7914275117.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f7a7a976f3892aa57b5eaa9cc7affc4a/tawon.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37b013d09---bazeferivuf.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e93d84d6---sovibudorugukar.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13706 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_02_sfnt_off00014c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C15 20108 bytes
SHA-256: 273b85064e180623ab7088b006ad4bc5ce1bb1c619a53d456124f6bee0b102de
font_03_sfnt_off00018200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18200 11616 bytes
SHA-256: 8f9388ff6b1ebf653b40d1bf7348a5a0baec31b60d9b488379fcbd83fd9e3bf5

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