Malicious PDF — malware analysis report

Static analysis result for SHA-256 5652d0b4b1d6ecae…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 08:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00278940d7578bf8a5e07a4160056edd SHA-1: 6e66e2b49879b8a80b0ccf2e7e8455d6217defb8 SHA-256: 5652d0b4b1d6ecae9c9ff5a0dbddf4446dd5e6ef3a61f65e6cbc47fa874e9eee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are identified as link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=the+ultimate+husband+novel+read+online PDF link annotation
    • https://togeltop.net/contents/files/17999629733.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/jirazokizuzomepof.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/94208589843.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091100514772.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/wibikerewanexogojasetob.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/20980727608.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/67413945494.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/51971556551.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f5a0a1ed13bf39ba1f99e2d8e7218fa/38555801585.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/45170751242.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/61906924292.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304ab006318---nubife.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/87738099242.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/wivanunevunedeme.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161352d56175c0---simobezosixegoki.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/38134641039.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/65094516612.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/59773809987.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b03dac47a4954f49e23c9d7a53e959c8/47513761501.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/85562989365.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/jefovole.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398589b5fcc---90836409498.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8f2226a579f5445f902baf6800f5863e/kunebizewatip.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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 17348 bytes
SHA-256: a9ab9135fd8f3bea0ee9e2c6f6bd227aa64fac3cf4da25ba080192885de00c08
font_01_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 10784 bytes
SHA-256: 656a02ae143a2a7846c2f0350e415e40ec0180d992961f8c4f27124c2855dc9e

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