Malicious PDF — malware analysis report

Static analysis result for SHA-256 4579fe92f2ce9b31…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 18:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b643f2cef1cd04178d5b625cbab3571 SHA-1: 1719be32d2eaf08fced213ecca03aa46621abeba SHA-256: 4579fe92f2ce9b31b46aa1bc158d1c4cfd3360f77d9ad5e43ad265bab57762c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ilksolar.com/Images/Media/files/97222078443.pdf In PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/tedagolajof.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/23986408055.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613759709ea0a---7026780173.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161386d7187db7---94806488381.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/62208865996.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/zafukunuzajenu.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/nikogiroloxis.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310de9de90e---xajagufeliwibep.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/gofogikugavujolupu.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/99883855896.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/dapodenapir.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/79065821627.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/65789364373.pdfIn PDF document text
    • http://www.buildonhope.org/file/22110135275.pdfIn PDF document text
    • http://esistore.be/userfiles/file/71149849472.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/dozujasubakene.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/50292178845.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327cdf66cbb---ligoxomevop.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/xutirebekugowujuboti.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b6e9ed2290108dab9ac7bb2aa2d3ee2d/5713738453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+reset+app+androidPDF 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_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 18000 bytes
SHA-256: be7d8c6b49ba71d630e40247d6660a97e96bcb0622eec6bd9f20101659468205
font_01_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 10416 bytes
SHA-256: e33197c5edd9ca5e1adc1c153bff590c14bd9be6a411c10c0fa6fcb96f41c0d6
font_02_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1