Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ec104afddd9b68…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 14:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3513b6a2925ffa063ec09b11d094f90d SHA-1: 4ed72304866c76373aafe91a6394e1812c91cfcf SHA-256: 61ec104afddd9b6879507a5d63cda53f6fbba1196a09df38ede843fe887e9254
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to various domains, some of which are hosted on compromised WordPress upload storage, suggesting an attempt to distribute malware or phish for credentials. The presence of multiple links on disposable hosting further supports a malicious intent to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fjzy18.com/image/uload/files/penoxawewomazogo.pdf In PDF document text
    • http://fermobkorea.com/userfiles/file/20210906222317.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/50380393827.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/gutunotujemineseva.pdfIn PDF document text
    • https://2winit.com/Files/files/15481969646.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/72796289104.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/79198207501.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210909162756746467692.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/bizubulusugipodesufiwufig.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc405d62fe---93859633544.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/50992467180.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/99544006385.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/muxagupikapamevipa.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/28376970186.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/matojegele.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/nunigiwibutetexut.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf66487d18---9445872939.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/50011204222.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210906_691EB3F4290DC152.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161381fd2bb6b6---garopowevejotaz.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/mepuruxoxemikipusu.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/26386858810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mobile+bus+simulator+mod+downloadPDF 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_off0000bb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3F 15932 bytes
SHA-256: b4de8b83e1f9d0172fd0a4a0563ba67c7f27bfe22d1ba9e3c9ca6980a2e90706
font_01_sfnt_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 10728 bytes
SHA-256: d1ef456a5add1bf8b113a1e939b733ececd3bc45ca6b6d7ca7378c872e8d5edf
font_02_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1