Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8ee7875ecb7251…

MALICIOUS

PDF

89.6 KB Created: 2021-09-08 06:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ca67ef5ca0c99c185a775a43f61c2021 SHA-1: 5608c8c0d175c4a785f01fe28125aefc623d8810 SHA-256: 7b8ee7875ecb7251bb4ad5553296d5b3f080d18a2b84f42a8dd41c9c28847431
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The PDF also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to obscure the final destination and evade detection. These elements strongly suggest the file is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d14ac413a---luvobixilitipasenodapumow.pdf In PDF document text
    • http://abwferrellpkwy.com/uploads/files/pisatukesajar.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610327ecd83cf---77115569312.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062351911_285963083.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/wetoluxaloduwefezeker.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/22560229285.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/87670869599.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082705ec0fa8---sapidib.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/30275392487.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089875c9efd7---6741350093.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/26a01ee78c316e88c66b9cd2905d79e4/movibopazot.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e52657a1db2---fikuxopemagosijukelifi.pdfIn PDF document text
    • https://linker.tw/files/50239512998.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/gedarasuzolojegixapexibe.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/232318811ec8fd74196e9ef77ce7b838/jelifili.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123afcd86146---91122004725.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/wekarilakedapevikegi.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/55440254861.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/50154629784.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607312fc19c0c---vuxefadowazikajatumaxipul.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078912e1ab41---46120063010.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/84068480805.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ca66bfde8---xalefajove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=auguste+villiers+de+l%27isle-adam+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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 21072 bytes
SHA-256: 8c5bbec1169995dc8d6220dcbdc85e4b6a3c44eb9dc1fb29e2ba8dde23b16b7f
font_02_sfnt_off00013e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E63 10832 bytes
SHA-256: 34cf6dc476af4c9fa8022a7ff533921bb1400e1b42ec1188204ed448063ff23e

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