Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b141be3e18771e8…

MALICIOUS

PDF

87.7 KB Created: 2021-07-19 03:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8c5ad0a8026cd4ed805aa1f75435cd69 SHA-1: a26c4019f9a1142df852ba97b63742269625a3fc SHA-256: 4b141be3e18771e85b6106f8f23cd18215542b479ae7e22793756da625f7dbf1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute malicious content or conduct phishing operations through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1147a24b---17892817164.pdf In PDF document text
    • https://cochleartudaskozpont.hu/files/69007008676.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/26671190721.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/83121322708.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a05690a04---75686390447.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/lewetutenorolazuwusewis.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/xowelege.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/81656002740.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d7964b95174---norizulezufikalu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a7cb1fc9---55563319950.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/47715039710.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7a512a4c---fukijiwubezenekuj.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/tp3pde70d9p1b7dc2qcl6p8if3/fufopufubizilebivopulezir.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/sizikavuga.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nogexalo.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/51630681964.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lalamarir.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be314c6636---86715936867.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953a655fa72---vojigatimotipulagef.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/dedujojibovop.pdfIn PDF document text
    • http://temple.mo/userfiles/file/zeruzujufatejefolufazowev.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/tukobotelebetepapo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad190e22651---godijamavaka.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/322946ea9dce26b9113793476573b83a/bevuragajidugosaposefa.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099856f481ba---zotewolokuloropubixolox.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5c404a35---91107852320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=vidmate+app+for+android+old+versionPDF 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_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 10692 bytes
SHA-256: da0878d86eed6d532e6738da7c8eb4da51088bc0faed3dbeab381adcf41e1d33
font_02_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 17108 bytes
SHA-256: f74f832e3428e580040054142317444ef7b12d6ad134e6f4dfb1ee0047c3d1cd

Open this report in the interactive analyzer, or submit your own file for analysis.