Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d30ef116cfd2ff…

MALICIOUS

PDF

91.4 KB Created: 2021-07-05 16:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 565e03a4aab720e5872851e98e420414 SHA-1: dfacb434b815df2a315e9edd064f54cbb064eb85 SHA-256: 28d30ef116cfd2ff0fd9691a81d3a31aa7671108a94a85ec856737c0984e8018
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/huglqaeqk1ajr0128tk3kcbal6/60512239091.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3adf488e5a---84042070385.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/36153015027.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/47448499282.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/f4q7p9p9l6r812j13o18uj084d/gorobiroxosaxirifebatipuv.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160831be8d488f---23219078589.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94312ea3f---sobumujemanumuziroziga.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bccecb44f---85666419018.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b36701643187b070c18091ff067d4890/futuj.pdfIn PDF document text
    • https://bio86.net/fichiers/rotivo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16075eee622b96---8929227021.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d1c4eb39a91c13735df7fe4fb2b3726a/66812193595.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210628_175507.pdfIn PDF document text
    • http://spiregene.com/image/files/20210626_085853.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/semafututowejuwikudepobi.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/23072425027.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8f1e751a21f1942d0cdc480f85bc1b72/vilurufivuj.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503134429735.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/pddbl7558n5ns3hbsfgve2smj7/21617419001.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bcea198b23b20e460ab02cbc8226c2a1/bikiwukumimewe.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/91182443460.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/69348012588.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80475bec1---59406892878.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c70403f83---dewitij.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/045c148339149d754d6b051feec85f62/sitapuwedemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fig+tree+no+fruit+biblePDF 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_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 17748 bytes
SHA-256: b46defd0d49a50726c0edacaae16d8111f541b97a27c94430575aab803b2bdde
font_02_sfnt_off00014917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14917 10276 bytes
SHA-256: c1df57c8f328a2aebaf946be24e917b9228eb61a1e75e10e9107126521965d5a