Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8554daf4ea6eddb…

MALICIOUS

PDF

89.3 KB Created: 2021-07-02 06:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 344c7c406cb104ded7e7421755ac0ef1 SHA-1: ef9235453ae900106613c6a9c173cc49bd393ef9 SHA-256: e8554daf4ea6eddb96cca747065112f442204b475693246d55bf56b286a1389c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress installations. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these compromised sites. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/3aec8325300038e6e9ba8d908df94e8d/sagalisi.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2019d5d032---42348348365.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2a5d77082e755cb074c58132de87d9f6/90792557350.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e215e79427---wuburesikonisexip.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/virepatotiriwur.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/wunopuberenezusefobuv.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/sixuxideloxagegitupez.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160845f741ffa9---vivabukodesabirir.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/kizejidok.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/6nikb3kh82tet8ls4ikv29mdli/54194792896.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c25d2deca---46668851324.pdfIn PDF document text
    • http://candientushinko.com/images/file/pakafu.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/gakekolaxifudu.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/33941848993.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a41c84ed3542947f384d3454eec617ff/23935827974.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/rijatuli.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/89036341675.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xazebovirozewini.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/67004493955.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/livatabivevubuzajupujaden.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160957b1f54580---15574221515.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/74471491194.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/21625869371.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096712952d36---paliwemu.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/79359392948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=terraria+console+best+weaponsPDF 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_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 10556 bytes
SHA-256: 8ddfd9e2652a4a29c539e226268d8689c0060afd33fc293b6300e3d72729e70b
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 17300 bytes
SHA-256: 155dacb7c5f4f2dd391df6b39a4d49d6b760363b13b21ce0307df962f6bcc39d

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