Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb236b79517aa80…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 02:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0290b872e964e4fe75830ea3c6a1e82 SHA-1: 825698c5d103470c10907ee2090b04197f434286 SHA-256: 6cb236b79517aa80f7ec83ba86f7e81b3ff4ed7178828d63e09a7b5534cb2425
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple disposable hosting domains, suggesting an attempt to distribute malware or phishing content. The presence of external URIs and a link farm on compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xmzhj.com/UserFiles/file/wugojikezobubixomulunupej.pdf In PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/manesukofi.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/80240340900.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/47998330951.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/xosedepofonusudofeju.pdfIn PDF document text
    • http://greenglobepms.com/uploads/karujunomob.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/46069066885.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///11948740411.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/kekokepifepiwawej.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/45017231652.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b79b425e---megarafoge.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/linekejekibakexox.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/97741094958.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/45021279291.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16149323ee0a1e---37265473957.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/66474674695.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea546561a---suleguparevuragowo.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/goxanotaxefaretevulak.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/xupijojijagiwubilapuz.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/11450329591.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/xogedudige.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/87046120514.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/40062949855.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/gumojebemorem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cobra+iptv+ultra+downloadPDF 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_off0000b573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB573 18028 bytes
SHA-256: b7648662d3e3b5d2b3738624a4cafd4b8029fa9888e3132feca55dab90bbfe64
font_01_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 10508 bytes
SHA-256: d74090d6675aa1f48deb2780a2979aa395f23466b7d7562921031316259369b6
font_02_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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