Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e9b8dea6a25d5c…

MALICIOUS

PDF

79.4 KB Created: 2021-07-24 04:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9b6b326561ab52d185cc96e34fbea90 SHA-1: b53443e2462a83a678a2d9a827e77cd4abaa8074 SHA-256: c3e9b8dea6a25d5c7c0f0e022ed0f47810798cad1c8d25ac9b90a525aa7f78f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66458be76---buxonaxisugobaj.pdf In PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/da111433c3d3b9ce5edd000c0de3db36/27539901329.pdfIn PDF document text
    • https://designclarf.it/file/1397478006.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/11421662305.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/lidabowunewababimim.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b834454fef5---temenigipuxosadarinani.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/450864dcb0d9331fea44b16115c61a73/fofavonudutomaw.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/tikotirumugusetiz.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db45138f90b---pilelijisidatukixab.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/cf8j1k8a8ii4nggq1qi5hetn49/16929840782.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/d9085ea85ce8e2f1c089bdf48e45ea5d/2501873058.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871853d0213---40322128426.pdfIn PDF document text
    • https://alutat.com/data/file/14020999209.pdfIn PDF document text
    • https://sbufficio.it/file/1449007628.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vcb90s00dnguqvoneisj7635t1/kiravisutaruxebotuwuk.pdfIn PDF document text
    • https://tepihtrava.rs//files/lowunexepejevinod.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f13d4c1c1dd---70505779212.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/lutikivefonozipojozixutum.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10607088d---sufobariworuj.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/901ab529e544352f7972899c1186433d/vatalirageteragexijo.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/xijunobetumisobidatokij.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/51671288547.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/lomeletumekofitudure.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/1rusmpro98m5mbvmpi8qsbhjtg/diwujutogiforipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=punctuation+worksheet+for+grade+3+with+answersPDF 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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 16964 bytes
SHA-256: 160ff732a1e9795277907f3ef20fd147b91fa27fc02147c77060d6c0bb5bb4ec
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 11160 bytes
SHA-256: 146a373ae28683826627ecd66bf5f3cfcab7857290ad8dc270cf38aace8385fa