Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8223f19126aff9…

MALICIOUS

PDF

88.7 KB Created: 2021-08-11 17:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cd9100e26ad5575ab3ceaae70471fa4 SHA-1: 59787206c796a0d8befdad9cb89a8ed66bd1d100 SHA-256: bb8223f19126aff9de8aeb92dc36c718c850dd54bcbd4847be7d02e069571814
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing or trojan PDF. The presence of numerous links on potentially compromised infrastructure suggests an attempt to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c44d77bd64b---xewixofewuniripajugagavup.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c47d1f60---mepoxafefu.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/maninovipobij.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f73e4cc28f79b6152b1912b9050e2915/pikuziki.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tcovta2q0838bgu2qal4ekvnj2/jedamugisubakalir.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/wupifonopogik.pdfIn PDF document text
    • http://e-sportis.com/images/upload/vanile.pdfIn PDF document text
    • http://placc.info/up_image/99148120008.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1fb202fd8---kizabiferexuwi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad46bfb7e---wusizebewewekili.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/3212180389.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607adcdbbe74a---63236013222.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/16772215428.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/203ef13d78633b9afab8c71bb579a80e/ruwurut.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a057598698---63880752215.pdfIn PDF document text
    • https://onelineservice.it/file/52246597504.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/15878877944.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/25102894215.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/zenatupa.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/bosasakokovudejiluj.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/88160859032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bsc+1st+year+zoology+notes+in+hindi+pdf+downloadPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3e45638472d790e53678a19237bb97be/59339001265.pdfIn PDF document text
    • 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_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 11264 bytes
SHA-256: 3f1899d70c341e549f3750274d4c6ed242bfc93d1fdbf45324efcbf38f112df3
font_01_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 17156 bytes
SHA-256: 89b73c48313c05ca56456e146e0ff0488fb8d2fd5b9e32fc525993bacf6b4886

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