Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71d869c84dd096c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-15 23:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0213618bc5c2b1d898a7c30958d46d6 SHA-1: afbacddf775db3ee541a628b8e3d7a924e597fa1 SHA-256: b71d869c84dd096c80fd61d61f71b37f093e4b81ae940d77ce3fb6035c31ab60
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=the+cay+book+pdf PDF link annotation
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o0lh2tqhq74t8asrr2hev4lsee/gedukobudekuzutezag.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78398d104---tojares.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/xonuxaparekijasiv.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/lariluditukim.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210905_7AC3C44524BAD507.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/36d4686a3ea2605cf8a07a0c8e8f0537/83241584281.pdfIn PDF document text
    • https://interconformity.ro/images/file/botox.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/579a930b0e0c9af81f780cf7bb3c90d6/94043472305.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/saxuvedopoda.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/89869363604.pdfIn PDF document text
    • http://surausa.com/uploads/files/8430815926.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/65829187266.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/88883392023.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133495675648---kaxusi.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/wavuzefepibamupaxurowizof.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca12ce9b0c---sefalipakeraxu.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/doxamokopazawotofomemajaj.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/79932819677.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/rebafu.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/vobede.pdfIn PDF document text
    • http://semut73.com/contents/files/naxuteram.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/morumixotu.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/xizesokedifurebapikevud.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/luwewej.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_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 19884 bytes
SHA-256: f2548595e4cd24593035bd539aeb2204cfb44f0a60657682edcb84c9e644801e
font_01_sfnt_off00011d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2E 10420 bytes
SHA-256: c9009c86bfc1fb49ed10c4bb6dec55e7909eaa2d82d5a9ac2f148ea1d2f0ac37
font_02_sfnt_off000134bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1