Malicious PDF — malware analysis report

Static analysis result for SHA-256 65579b9cb5d7e3a1…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 04:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb71c61b5076dc060668bbcf648a4407 SHA-1: ee9cb12a57302c03d463c8d8e1a7ff40d72afa1b SHA-256: 65579b9cb5d7e3a18f79beb8e340b19ec98485dbe19815c2d828485003754fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of 'utm_term' in one URL indicates SEO manipulation for potentially unwanted content. ClamAV and ML classifiers confirm maliciousness, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=plants+vs+zombies+2+download+mod PDF link annotation
    • http://full814.com/upload/files/rimiradogagibepuregam.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c57d059e---xelulerowenezomimikaja.pdfIn PDF document text
    • https://tckontrola.hr/files/podagulowabajo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/11662468959.pdfIn PDF document text
    • http://rvhifi.cz/files/file/fixepad.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/namolibukiwejokobodi.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/korofulimamafelujug.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/75752668213.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/lisefimudazusijopusumewut.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/ziwatebudamalabulixev.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/34799768575.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/dafonovonapozozurefuzuj.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143c6bd918e5---nazuvuwubivisavare.pdfIn PDF document text
    • http://e-sportis.com/images/upload/60315432100.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/38532431222.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d109ad9f22cb9e6c5ca5267f9f313eea/14417968820.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/puzukav.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/9849277152.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75257383741.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8475eeb8---4354773327.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-15/20210915224323892175.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/96929161355.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/79740513886.pdfIn PDF document text
    • https://atlantidegattico.it/file/93980499818.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/97364432336.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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 17420 bytes
SHA-256: 9c378e419c6af5703d7af501b2bf8a25c62f88e344e7d292976eb2b29280fd86
font_01_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 10784 bytes
SHA-256: 17228a3baeb56f2370c375d90528ff7e619f7d78d35680497596d0b8bb9cfae6
font_02_sfnt_off000128d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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