Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a07e8822dff1d4c…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 20:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01e1f80389de5fd6ca986a1964c11750 SHA-1: b837f2221e3e89cf9c68c0fad1accef95d164013 SHA-256: 9a07e8822dff1d4c7ef52301539051b8fec75803c82d6ed4b0269973e3b53274
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396490681d5---17880605520.pdf, are likely part of a campaign to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b13c68ff---toferofeku.pdf In PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/2610269375.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109012327228344.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/82532416992.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/wesusura.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/35699548723.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/dojijuzonomadonumosozivu.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/33723951287.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/waponatopuleru.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e455c648---99424123284.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/juvoduzusituva.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/42542941429.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/giwabifuzus.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/81809778900.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/87889937135.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/religigiwijewinasazipatop.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/35078033333.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396490681d5---17880605520.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/gudigov.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jbl3iu6g3aqlr87r1hjmlg3h5s/vuxosopiriketot.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/xedajuvurepanuruwe.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/rumijopituwotebasabiwile.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/gozoxufafedamixavajiv.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/38060010789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+soul+silver+hackPDF 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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 10656 bytes
SHA-256: ee2a8687ad9064c17ff5cc065d8e27ff0c48e9db6514073ccc3601b230a44e3a
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 19780 bytes
SHA-256: 39794388a8880c98ac22dbbb201a85c7e1ace907c504a05d484d17fe931ee891
font_02_sfnt_off0001394d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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