Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd1eef9e21812f0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 22:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88cfc2a0469f9bb0bd3533de129d423a SHA-1: 9ed911a2c4a1dfa780dedeb70e7079d2fa406bea SHA-256: 4dd1eef9e21812f0ae0865822b01f0ea742fb5c4ada878ee05531bbf094018dc
124 Risk Score

Malware Insights

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

The file was detected as a PDF phishing trojan by ClamAV. Static analysis revealed multiple heuristics indicating the PDF is a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

Heuristics 5

  • 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
  • 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://studionegro.net/userfiles/files/rasokuna.pdf In PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/70528537806.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/gozezu.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/kanawow.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/69833408102.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210919_221801.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/93768819879.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jelenenelavelu.pdfIn PDF document text
    • http://guchen.ru/d/files/11409529661.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b196f172---18402353575.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67848666582.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/gijelomebabox.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378e675b32a---winet.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161379852a9b08---romigakeg.pdfIn PDF document text
    • http://metallpress.info/files/xipepuribidupup.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/21748623126.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/sajuduvoxogifikosi.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/wudagi.pdfIn PDF document text
    • http://groupkaishan.com/d/files/kavapivifixewelas.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/78832862239.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/xaxotuvuvotitavafopisob.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/zunujikopafanena.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/5109942188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=app+is+not+responding+in+android+studioPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 17588 bytes
SHA-256: 98f49dec7f11113bd4abb18d9586621655a3223b77bec7b7650697daffbb8b67
font_01_sfnt_off0001184e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 10600 bytes
SHA-256: da40ee6eb072abc8ef070eaa21d3f4d45d386f693846544696ceb76858e941b1

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