Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e09e10943591f15…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 02:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5676e9e33fd036d31bc8efc99f244b58 SHA-1: 2888861c368645131828fc8a9d61cb63770c6608 SHA-256: 2e09e10943591f153e4d4fc83575959e9b26f840f6b264235b431eade21c5878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous disposable domains and compromised WordPress uploads, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=builder+for+mcpe+pro PDF link annotation
    • https://khonggiansangtao.com/platformecom/img/upload/file/netufeguta.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/gebis.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/gedotowa.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/dotavezomewolaxitafunew.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f44c711a20---86157974766.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/28028316538.pdfIn PDF document text
    • http://x-mobio.com/upload/files/59237584007.pdfIn PDF document text
    • http://trivio.it/userfiles/files/nupuxagijozawuvosovode.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161435a2330699---genipokakegatugarizekuve.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/rabojefid.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/69643876885.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d5c6d4d69a8c556a8f9c61efc46ecc51/notapubidodegosek.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/17104408818.pdfIn PDF document text
    • http://timocomputer.cz/files/file/kuxax.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/38856789005.pdfIn PDF document text
    • http://rubensova16.cz/files/file/jinuwisoratijegize.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_220233.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/44715718077.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/76215943367.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135987e2affd---naxexolunaxosewojolukes.pdfIn PDF document text
    • https://revive.fashion/upload/files/jofozidaloxukirajozo.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/26084762902.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/rokonopixuvorakij.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139107f2c351---74099747220.pdfIn PDF document text
    • http://tano-cable.com/d/files/pexetusikurewomimuturexaf.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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 10404 bytes
SHA-256: dc017433228475da4baffd1e72b2e1e76c1d9535dcc467854c1401c06104a5b5
font_01_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 17920 bytes
SHA-256: 2a36f54fb13f7b189bc60d640d47aa3ca82db408efb6048ae9694f4032f0c4be

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