Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f440bb5d78a603…

MALICIOUS

PDF

90.7 KB Created: 2021-08-04 11:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b3d45ac92f79f2a58931eb8bb74aedb SHA-1: 701f75fa19fc3360be0e4d6be988c91e63d667da SHA-256: 57f440bb5d78a603b9c64a43e7f07b78ce9c78ef64ef36a0d6171b86affb108d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/426768ee97acb58ae653bc2cd234d6e0/kesedafobuzopelizipebenet.pdf In PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/c181b9ca5b2caad65cbeb41e67c795b5/wedevusanido.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/kinesedaxojazurulumatulok.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/webufiko.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc5045624---nebexele.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tpvubsp86ptqi2pfu97pee00lq/niwemoguravunagutexime.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/kutuduvojifeve.pdfIn PDF document text
    • http://www.moyekolodin.com/files/69721308635.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d68bae03---32475172662.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d48c562a6---18643796051.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/08c46abf6cebce9b065ab0d3e020630f/jeposam.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dugunituwi.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210717174237.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kipopenudusemivitumurus.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/59940976602.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/jenuxidadaxudibuzuwifo.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/pukakuwatififu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02d47f466---rexovunutiwifataxuwenadi.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/lumilaranegazavolozofel.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c210e3a1---kajezidizaw.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6c488c98---56637936734.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/f68c2e8efd78c08b897e66d15010a5b5/lozoke.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/976a8ff59abfae70adbb75cb7bc7ec6b/sasuranexenivodatizusixo.pdfIn PDF document text
    • http://kicopump.com/FileData/ckfinder/files/20210618_E29A40345BDC7F35.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=every+good+endeavor+tim+keller+pdfPDF 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_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 10928 bytes
SHA-256: 42a1e48d4502f741c0697dfc875fae0fd1991e32a20a8c0c36feda5490c4df92
font_01_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 17272 bytes
SHA-256: c27d49fc4dd8c18b3bc4fbfb4aef16b6d918180a5d34d59b835fead516384ad1
font_02_sfnt_off000142d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1