Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0fe79ecee7f01b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 05:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58bcba60c52307c0f033af9eb119f1ed SHA-1: 2f7c2541bf0debd829a869878bf8ace167c390a1 SHA-256: 7f0fe79ecee7f01b4f0fcd2e09e9988214c73298cde389fd7cd72d9de2a6ec44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=mod+apk+of+hill+climb+racing PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/96406022ed02724c65ae9c25206e360d/dinelibewafesapeduven.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/pikogidodol.pdfIn PDF document text
    • http://beta-rc.com/upload/files/61595252615.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/sezagelam.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210909190113_383289355.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/zavaxoboru.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/91b9c90a3a6c39e661300d56a506dbae/63044711549.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/69184276123.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/47475238456.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351bfa2bc26---fexape.pdfIn PDF document text
    • https://esz.jp/img/editor/files/94334306795.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/tuvisemosawamutilani.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///faxuwataxumewobevuporojuw.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/zuxesuxizogisizuzezo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/sidajobutamakawinow.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/rujuliter.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161409bd79915f---nodinad.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/godunaz.pdfIn PDF document text
    • https://mytopics.it/uploads/file/fadipixeva.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/duboxufiw.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/jekufebuzunipuduf.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210918094729.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161324151b7989---6825169865.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/79936281274.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/vizusi.pdfIn PDF document text
    • http://kaies.net/upfiles/file/42877418077.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_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 17524 bytes
SHA-256: 3367e4a484483cda477aed727a7c48786602fa62cd3b603c1428ef78a78ecd82
font_01_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 10896 bytes
SHA-256: 350712bb4297721add0467ad1925230069f018e4ce0f4a295ff33fcc5ab8e6be
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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