Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fa70ea1c3642ad…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 04:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8add6da48b5fbefeaeb4fde604f64b9a SHA-1: c669b42208fcbcf4276f2ffc72c2ff24faa91ccb SHA-256: 55fa70ea1c3642adecf643a8a1e32e56a86b22380e2d86b2e8eee7458b2c12a4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c89c634c---polomijekiwowedonasifubow.pdf In PDF document text
    • http://nikkenj.com/userfiles/file/xunekuzavit.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lubexodizixub.pdfIn PDF document text
    • https://seerupit.dk/assens/file/bexobibuvudilab.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/fikikosoxajuxasob.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e434ab5aaa---16629716007.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/lufivirobumozok.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b37809e5c2fc7072eade5ecf7d99320/39436147683.pdfIn PDF document text
    • https://bem-sa.com/img/file/33363798800.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/7374121315.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/6276652738.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/37928063856.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/gawiripesomelipe.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/lotulupepilawidabamovoxal.pdfPDF link annotation
    • http://esipro.fr/userfiles/file/wadidukalesadu.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/bumugifelezizexatapido.pdfIn PDF document text
    • https://2winit.com/Files/files/gojopopeb.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/62128068616.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/520aebb0ae210398ac21da25ba5bee87/1640604060.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070565b61896---14896490716.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/bajemejotewimesuludana.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/5iu2e5il6t88nvf3ufiejuu8i6/dujesalakiwekokowazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=plantronics+w740+headset+user+manualPDF 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_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 11072 bytes
SHA-256: 4bcbd6587f25a2981c670729b0fc0684f7da1e5828c8825c57dfa22e8e2af8fc
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 17356 bytes
SHA-256: 1c575f82598007023630aac2a6126282aafde6030e98f24528ecb3b95e0f98a3