Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2dde5cd85ba3134…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 07:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18ec53a7e47a1e3781c7a7d41409aae8 SHA-1: 3cfe45fa920d9049429ca2f3d85d6b728d59a4ca SHA-256: f2dde5cd85ba3134badb3c6388e42c75abd21605c5a10f28984d932425150132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and potentially disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution, leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370ea8b7276---pakutovokefuzol.pdf In PDF document text
    • http://colafranceschi.it/userfiles/files/lanenisobiko.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/gikuvexof.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/43027219070.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/1187138691.pdfIn PDF document text
    • http://xprchemical.com/upload/files/wubozubularubusu.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/gegefikipisoj.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-11/20210911074634987696.pdfIn PDF document text
    • http://parilka.by/var/upload/file/27346233940.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/84877791547.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/kifexiboduxumujogot.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/resomerugolivijumovoge.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/fijonobovifolero.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f7a2d40039cac6ec35ba731cd842efd5/2732222218.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/75484498093.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/93850345315.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbab213ec---luxamidugo.pdfIn PDF document text
    • http://xtra360.net/campannas/file/tedasovevufiviluza.pdfIn PDF document text
    • http://keyday.ru/files/files/buzunuzexifatiwazaxu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/13333586212.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/wadadojuzalejatupomub.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3d68946ed2222cffb9a48bf47b4e5029/zasafowojowafidimut.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/63479910138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bass+roblox+idPDF 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_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 21500 bytes
SHA-256: 672546a4940c94240b5ba9e6d85a437c00ce1ff2c6e30d3d681325355930f451
font_02_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 10204 bytes
SHA-256: 9a48f0e2f804046e7e3932fa2087b81a26c4827f7134b8c448eb6a8296a09b0f

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