Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cd365ba03e4348…

MALICIOUS

PDF

86.1 KB Created: 2021-09-19 02:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a259428b4a9e739075b3f6b2c7e6bad7 SHA-1: ef1115e13a7c1c1cfaa37395acf6014c98f1348b SHA-256: 00cd365ba03e43485ac3e52ac3ba87ea7b906d20ee7445c500f93adb262ed7ba
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ex2010.com/uploadfile/file/2021090701322773499.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gaongtdpo23hvgqgq7g4junnd5/zawosuranotil.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/dixolag.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/48662922198.pdfIn PDF document text
    • http://tercovci.cz/files/file/89300334105.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/66452421931.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/fobifuruziwuwatedud.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/sidajobutamakawinow.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/mofipujinivesirix.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/59392041838.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2e03b03dca4f6cd20889f1bb2e3b9241/32120659288.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138441eecac4---57644410250.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_C9D5303BA59E4C94.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/88001770123.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/40209177545.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109020906388278.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/miruk.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614550dd33f17---94686923256.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/zabudakawujadaz.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/nekoxejotidapi.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/46163688829.pdfIn PDF document text
    • https://hot-pol.com/images/file/6390667151.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614081f59e797---lakovemuduvodegowukovasog.pdfIn PDF document text
    • http://gardatrans.com/content/Files/lisozad.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe95393382---topumo.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/fulabumupag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gujarati+font+style+download+for+androidPDF 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_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 18264 bytes
SHA-256: ec23bf6b6a3b0dbc94b5beb11f240448149234d276507e45a7d350ccf60f9913
font_02_sfnt_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 10816 bytes
SHA-256: 6a0443c63b857ec09f86d4b58f1c4df34f3fe245922c417e3caea56f72329272