Malicious PDF — malware analysis report

Static analysis result for SHA-256 5587513cc6a4121c…

MALICIOUS

PDF

83.7 KB Created: 2021-07-18 23:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ed2c002da66018d3ec11339c21aeb25 SHA-1: 34374a4f8ae1e1bc945dfb623042b79223338e6a SHA-256: 5587513cc6a4121c5635f59d19d594c0fa4cc142cbb1923b468ee7daea8bdb2e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726309d220d---fegowusilemefibe.pdf In PDF document text
    • http://hodinovysoused.cz/upload/file/44906762947.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/valagemo.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/17641816295.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ic79statg2rkoeavvk49kkrl5r/28346717878.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/bidede.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/84893912523.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/12125167292.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ee985e39fdef42e24df950e1262fa50/xidezit.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/tinewosarusupiti.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7045aae44---mejiv.pdfIn PDF document text
    • http://secretinvitation.net/images/files/lomokojubulu.pdfIn PDF document text
    • http://blatt-gruen.ch/files/37486427816.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/8kr690ppns721klipe97atvh2q/woxugopof.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ef2516b9a58a5c1117b308429fe9a53c/90311032983.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b7772d81c9aa45c32297c2d2b565a98d/31786898808.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/91586936476.pdfIn PDF document text
    • http://zae.me/datafiles/file/19043029242.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/34419928860.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160890e2390b58---favobisesonigifav.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/4623153971.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/33634170845.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7f8c46d96d9928a99f9de0edb76e6721/wobitonesuwanubefap.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/32655391178.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/pdsbsbua8lspo32t3n6fdp1jpj/11672894519.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a84d9e84---zekanupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=s+between+two+vowelsPDF 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_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 17092 bytes
SHA-256: dde75b8fd7d81d4980c30dba70dfece55d63062a17fee70b4a0379197d453dd4
font_01_sfnt_off000113a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 10116 bytes
SHA-256: 2e16e3a4bf0617dc7d5b492182020652daf0e951c09172c7f5a6ba884500bbce

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