Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b658888eb5cf4d…

MALICIOUS

PDF

87.2 KB Created: 2021-08-12 04:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0f55c87769a1160a53309863025f526 SHA-1: 8ebe9bdd2e41c80782700dc05fb0ebc8bc231d38 SHA-256: 47b658888eb5cf4df7bc20cff5d100f07b9c5983af521fae3f563f1f77ba2746
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV strongly indicate maliciousness, likely for phishing or malware distribution. Although no scripts were extracted, the presence of a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://tcremich.lu/files/files/jarenijasomaze.pdf In PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ee70ad3ea816a21896aaf7e62dd82c5/68498544582.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/wusotutagagopi.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/57388120422.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/gukavimawu.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/dajugagiweledadu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e2b5aa20dc344883d106287de65d2755/65920526715.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/bijigodizevix.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8043b4c4---21206780514.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/77767745962.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/c5ak92ufn9m6774dqg5ihs1im8/41974348910.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1623060176.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/2mt4ihqb9ts5qdmmhdf9vitpkb/bigopa.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/roketa.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b36ca4a519---pagikujik.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/74611914964.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/fexodari.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/46251969260.pdfIn PDF document text
    • http://www.moyekolodin.com/files/jebazokekozugekejawim.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d925a1348---9897542376.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/edd2a8ae7f383fa65630203343d30a3d/6720945386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=modern+strike+online+hack+cydiaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 17208 bytes
SHA-256: 803297ade0f2093243caa0439a770c9111e4533b00c456c100af2671c0d5e268
font_01_sfnt_off0001164e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164E 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_02_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 10664 bytes
SHA-256: 5ca2329eb71d0f5d1f64e85726ff82b182006f26c622e58fa6e19e9dc47c2414
font_03_sfnt_off000136bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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