Malicious PDF — malware analysis report

Static analysis result for SHA-256 93258cb808a6ce82…

MALICIOUS

PDF

70.9 KB Created: 2021-09-23 23:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1822a3eea8800ea3cc229f872adeaf0b SHA-1: dd91b5a831841a3e916db6c2fc0f2a07b1d3cfdc SHA-256: 93258cb808a6ce822367955b144f74d8b404e83aaa14531b34af704fa159862c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as the one pointing to a compromised WordPress upload, suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://horizontire.com/userfiles/file/57036225794.pdf In PDF document text
    • https://daiichitravel.com/uploads/news_file/2759360555.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/zoxawuposegatolefosipupi.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/gutuju.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/xuketinesik.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/zexafilowitifivopozow.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/lufilemomuxiwebagak.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/80427455634.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/75623902849.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/umunigbttorasg7u852h99pev2/dewuxilavukura.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/47261276499.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/xirivalif.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c813db22b---junenanit.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/20646649188.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/tiwajakopujebewavufe.pdfIn PDF document text
    • http://portableandcool.com/files/files/95916326004.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/nuwitusokelo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/vsch1rq2etqm9ag0cps28644db/gujesozaximoruma.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/zalarosumetuvodozesizaku.pdfIn PDF document text
    • http://hidropro.hu/upload/zinalu.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/50830855378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=discord+nitro+gratis+apkPDF 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_off0000b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 15272 bytes
SHA-256: d92fdf84e2c060af673d2f62e26ae248b9cb823af6ca7953c0d0dc3a52b6546a
font_01_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 10604 bytes
SHA-256: e23871f0186f9cefa2ab10afbe5d7c6c4e947f25d4f62d92f9567f7ce72bb342