Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f248f40e74ff681…

MALICIOUS

PDF

161.5 KB Created: 2021-06-26 22:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ff58f2597689830320a206c033fbeab6 SHA-1: 1df41d1f2b72a624d9d7c0376df677b5588f8757 SHA-256: 2f248f40e74ff6811ea4087f6551c6fec8d092a962ca956122a25d43213fb788
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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 http://hopkinshigh1988.com/clients/75739/File/91768222358.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/s3dtb93ogmo7mp6q02dn23v9kf/83113804947.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa7e3c9d2---gopemera.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087434ecf099---fufajosesagedexeru.pdfIn PDF document text
    • http://allasclub.com/campannas/file/8051389106.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/77983331431.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/kisezirelupemagako.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608138dcc5e18---jevotajipudefuf.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/67876287280.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6e9274f092112c52c66dade9b7f9cfe9/sewepewosawogunoxir.pdfIn PDF document text
    • https://medtek.vn/storage/file/vebotafedewitegele.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/15545245933.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609da3ad44d40---14333248731.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608072f1e7a0a---zumilejixa.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3afa4b43c520e28bf4cbdfdbbe178aff/xupaxudejijemabaki.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc91c8443---80912659231.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/66064393500.pdfIn PDF document text
    • http://firegallery.ru/img/upload/rusezadod.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c125db77---47145074624.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45e0d6408---75987732843.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe72a50f5e---kitoxisotonuwapufisumidex.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b56364b0---jidowexulokitate.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621256141.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5c12dca46---39562748934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=compose+email+meaning+in+tamilPDF 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_off000217a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00022fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22FBE 10528 bytes
SHA-256: 88d70b511eb2d453733a43a00e8954984c508f2ad5d29a0621ba4d453e860b5d
font_02_sfnt_off000247b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247B3 18476 bytes
SHA-256: b6962e3df9ac9b320fb9517ed2082c9ad59cac0e13573ab5eda3ae63b1b8d0af