Malicious PDF — malware analysis report

Static analysis result for SHA-256 31613aa6cddda57a…

MALICIOUS

PDF

114.1 KB Created: 2021-07-27 15:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb6c99146dee77da9f2a1cd21e30c055 SHA-1: 50c82b6429a2166f55d5588b3693cd737338dfbe SHA-256: 31613aa6cddda57a38a87fbe934adf93674119fbe79cc9af4192a72aca45ad7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. The primary purpose appears to be SEO manipulation or hosting malicious content, as evidenced by the numerous links to potentially compromised upload directories.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9338

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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eee8a919a---10339561555.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03d7a8619---84403361876.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2291d47e2a---tukulu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160985f6761578---18619025842.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/t0g0nqnbo7snbpbuiqm1gj9f33/59378296200.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/87789333096.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/83811032018.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c30b07ae308---48687209979.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/laribosisasizoroxulevuwu.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/88443664731.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/2842150664.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081214947df0---42669242839.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b46e1dca3---19460436366.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zujipevopemumirod.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1623644637.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/71712454615.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/vsa9e43lrtfkapueppg75itksu/35994878631.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ljveh9nlos7as14oqt8r258an6/xilubarodejop.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/fanaxividegotelubos.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/87382548411.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d03c7f53df7c55ab42c3876011e6013f/jepibogi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/sorulalisisomo.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/wiwexe.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/53193409705.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/r9q7mc9ba259k9eanpkv8hmov4/2656382105.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/nexubixarekowera.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/fifemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=food+wars+season+3+episode+1+english+dub+crunchyrollPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001a325.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A325 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0001327f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A96 11336 bytes
SHA-256: 4a4c013f9d59e1309a4a64a0b4a57d84db1e195c5a783d0c8894917ca4bcd8b5
font_02_sfnt_off000164d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D9 19700 bytes
SHA-256: f9373d2759788103a1e973b4d53d716b573d165a2bd3032f57450ec837e8d692
font_03_sfnt_off000198c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198C0 2368 bytes
SHA-256: 30e31bd7e8ace136e6e6abf2d44064d426e6367dd1ef1fc08c72100b6dca8940

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