Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bab17e3835d52e9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 02:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e75ad07de7eebcf66fc15f3ea2db9676 SHA-1: 6d331ddfd079e9e688fc21cfd61fab92ecb1b248 SHA-256: 3bab17e3835d52e9a15d275af03bf07b88762ee90678d9843d920a9f718b4558
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating it functions as a link farm. The embedded URLs and the PDF structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://saga.diamonds/uploads/ckfinder/files/ginubakojamewekexararav.pdf In PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/tavibaxikiluvojavavof.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9635a4038---10406896719.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/58619181277.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/dunovidajopowanawaxejamo.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/30236789883.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/remerofoposij.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/13610895558.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76d78def7---15531883137.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/65280187445.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/64698398991.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/77590699445.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/89408146358.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160984c5e2a2af---43913110184.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/42019248813.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612022be94855---gijijejoduvogizitu.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/wudasilokim.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9af74cad4---87746243338.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c11db59c374---fodawosim.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/62489491644.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5d69eede---79194232675.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e79224da---wipofagemomamutoxaxiger.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/55357889647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sumas+y+restas+de+fracciones+pdfPDF 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_off0000cee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 11024 bytes
SHA-256: 5f8b83ffe7c1374cda1c42bd937ecb61770b427e12b2fd80aae13fca2e56e71d
font_02_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 19220 bytes
SHA-256: 50125c6d6cff5e22da92af70c31340db335a2b6131cea2dc78aae401c046f518

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