Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8b2270bbdf556b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-08 05:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4682b2492708b407c9f717913a42934b SHA-1: 369f10b80ccea786c4ab005b761668f76d0a30f8 SHA-256: aa8b2270bbdf556b2f6dab4a52465dcb192247640061ba75afdd443f5a568f5c
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other potentially malicious domains. The primary goal appears to be directing users to external resources, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/o3u94e0ho7t51kas6ls7gb8iqm/15029940246.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf02f56c464---gupinidepa.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/14025960987.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/78893148318.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b20762144d0---73902325096.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/59354803991.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/minevovamifob.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/jaxubolivamijo.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f5a52f5ac4aae86468a8d03d8dcd66d2/dumewelo.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/25eb3f22d8eb5196b5d28f48b62644de/73389253342.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bqa8nba0c9ao2s6975aku8ob93/kumubusoz.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4286b7c8d119fb3e8391e8ae3a58dee9/zimoko.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/17699630415.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/43110547633.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/xigiloz.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/gejofatafijegujaweleg.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/49531517695.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/23975703835.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090f458549a5---19401956354.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/66223341647.pdfIn PDF document text
    • https://jobtiara.com/files/files/betejawitogotile.pdfIn PDF document text
    • http://www.siposferenc.hu/html/53479588207.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/73090161642.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/111429972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=abcd+worksheets+for+kindergartenPDF 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_off0000c08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08F 16072 bytes
SHA-256: 7f155941b27e241540c0655f84172e1565527c91138a8ada0bff6bd0028c6321
font_01_sfnt_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 11008 bytes
SHA-256: 8bc4be6550dea80726bdcfccfb64e2253193da343b078d760d11384830278a1b

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