Malicious PDF — malware analysis report

Static analysis result for SHA-256 37aca27ca11a55ea…

MALICIOUS

PDF

91.3 KB Created: 2021-07-24 22:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09fd3e63214b871980e6ad81a05dd3d8 SHA-1: cef1f9ae6522a5616a191632c2945877ae10083e SHA-256: 37aca27ca11a55ea8e2769e17a8b2e3bed726a57d7380141140425315ca9f0c7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute or host malicious files. The presence of multiple PDF files hosted on these sites indicates a coordinated effort to spread potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f68b072d---rumuzalajekis.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/c7tn5dhm3ddjecq4ge2lculde5/90116734104.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899ab90e7a---87473893815.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/0d2d2f3b1c04323fd4805d3727709f78/tolekozatu.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cae81ecea---68578202609.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/11c4b2163340179b74e536f5172b8f6a/23161402997.pdf
    • http://vita24h.com/uploads/userfiles/file/61876403102.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c421e7c3022---95859444211.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b077ef9b6f9---15183295217.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/77482798986.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/e3p0oc5abu8iqac8taibl3f86o/80473426784.pdf
    • https://giolog.biz/images/bulk_images/files/4153962267.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e40130740---baxijorosimi.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/49234839141.pdf
    • http://kasintorn.com/images/upload/files/70702430750.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62d2c0091---bozorejetavanuvewebo.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/48941266029.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d307af280---77748539978.pdf
    • http://raffaelecavazzoni.com/userfiles/files/tagubijusitufos.pdf
    • https://homeuu.biz/upload/ckeditor/pages//files/96229388615.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2c2d18300---roluroxanaragawaxemewet.pdf
    • http://brenno-tojestto.pl/userfiles/file/33870403304.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=google+play+store+app+install+free+for+iphone+6
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f0.bin
fc63509dd642ddd3cc41e27505943c38c9cbb31ea81ec9e548cc95b94a86fa8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 10960 bytes
font_01_sfnt_off00011a65.bin
d53c9093dc2c4f00062c93b791a66df27b4517ce959fff211c4090257e9664af
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 16900 bytes
font_02_sfnt_off000146a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146A0 16792 bytes