Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52ed09054132080…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 18:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ec0a0bc24fcdc81b195c6dc160f965c SHA-1: 522931498314fb39425bd0d9e70aa76628f42625 SHA-256: b52ed090541320802bf5a10f9e24354106b76176366bc2b4ffb2a0838d5a7048
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eb1dc33da---18824404685.pdf In PDF document text
    • http://grupposcorcia.it/userfiles/files/46024303282.pdfIn PDF document text
    • http://anpharma.net/upload/files/wixajagavogunigid.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/lefudo.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613560417e635---mirigurazuxexovubivez.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210912222256_mgueot.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/tabolijuguderusitogenu.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/84711677883.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/83260314020.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/44210148029.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/76616959551.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138d6105ed32---2297682995.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/gedixemafivip.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/kowomobirelizugamujog.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e93e2c1f7---kuzuxakefujinotigaxan.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/91853251599.pdfIn PDF document text
    • http://mq-water.net/upload/fasaxibefepetipopafejal.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/84448565225.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df23748b65---10888089926.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109071749201284.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zigarosawalet.pdfIn PDF document text
    • http://innotack.com/userfiles/files/narebutaladuvosukunaxexab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lkg+tamil+movie+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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 17436 bytes
SHA-256: 5fa3c165f7e302f16dc7cdae4530b89407a476a05a98e69adc6bf09b23416ec6
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 10524 bytes
SHA-256: 351b3eb121d35b34b40ddfb42df1abfc106bb95ae09e6c1c55625f6b12c74f70

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