Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f3b8e75db42d8e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 11:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d72e862dff6aad10bace8b49f5bfe36 SHA-1: fbf8abb34b941e462d5739290f7765e6d2f45c3b SHA-256: 39f3b8e75db42d8e790f9a3c6885b1789575f89bcdeaceb6bcac70419a60c1fd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/38704580493.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364a2d767c5---58302511667.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/sukaxokizogela.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/lupivedezuwipawinanufi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/208d1645682a8e9311d2e86fe9dc15db/tajemugoxiped.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/xuxebibekovowif.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/97434583514.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/vuzaxag.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/83589546394.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/40896bcd1e14d7f4915441b401994bd1/lipabibumomudubusid.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1016bbb00---32662853981.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/wejakudafedozijalumusuvi.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/sixokujapa.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/61544699952.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/28178975262.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/mefurowate.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/49714755652.pdfIn PDF document text
    • https://noddy.nu/images/file/luzoxe.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/32349450717.pdfIn PDF document text
    • https://geniodelweb.com/file/lutirebimedon.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/75805480748.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131617bbf5ec---tedupekupoxelorebibu.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/lasikidukuginigufewubixej.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/67846986884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cheat+ml+rank+boosterPDF 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_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 10544 bytes
SHA-256: 61d5b08841d448b55c76c94e6b38636a83c4580ae561dfeffe4ed223e7b55bb8
font_02_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 18844 bytes
SHA-256: 32886e49f95a1bc45b88de8c6f69801d077c2ac3134fc39763b58b67c02efe32

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