Malicious PDF — malware analysis report

Static analysis result for SHA-256 908ec3f4d34c1b80…

MALICIOUS

PDF

83.9 KB Created: 2021-08-04 00:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38730f43bd02f241900509800e0176b6 SHA-1: 245a5f5ee44713b27178c0bc44d52ca421f3ec20 SHA-256: 908ec3f4d34c1b807a5588bb4176e758065dc5c5c320f4a51bf2514449369bbc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into clicking malicious links. The presence of external URI heuristics and link farm detection further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6130

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=principales+centros+ceremoniales+toltecas PDF link annotation
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/24l251ak4tic0f8ku4bsecec7l/bivutunevutamawobuxubaso.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160892521cf80b---75684721705.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cab630f2582a2211ebe723764151a251/zoluvapizimanamewaw.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/lidojujotilape.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ac167671463ebfc6a925e151b68c653c/beligelululujas.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/54e91685b5b41962dc3aee0701fbcf64/27415649146.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4352fe652ab4c9d8a4be6dbfa55a0621/98453638077.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16082066c643f1---23089269093.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c110466be24ba8d1d1b104940f7f49fe/talulawuwepilowew.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a33fc316ed8---wipugejolumawepobaluje.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8b17add64---29470027466.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd015801ffc---83639119524.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/93059355504.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3ptf5vofntmpmjr9ng9o1nlnn2/vareriwumejisid.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gatesuduroma.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xupelogibezikanipidoxoto.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/79887021806.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ef32eb20---7830010398.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/muvopiliwuwisames.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca15a7c3de---38980763279.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/midowiwesu.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/61388629285.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/78132650612.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/75a3b4a4dd676d45a2684e42fa5d0273/zufazejobiwejujizodol.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/63291fe8ecb1d63cc4a0d731fd487ffa/47204643254.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 10536 bytes
SHA-256: 26a2f0cf17bf146910788e7c2c36462d18e5f9862d5251b7eb292fa67f69790f