Malicious PDF — malware analysis report

Static analysis result for SHA-256 5392663c2b1351ec…

MALICIOUS

PDF

76.7 KB Created: 2021-09-26 23:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7ac8a788902a5a884ce843bce71598c4 SHA-1: 7202dbd0566eba31ac68f1b42270b0884a00d537 SHA-256: 5392663c2b1351ecc5fba1b6a6aba34592d79a40658fe9fe1e2f9e608d7c9011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using these links to attract traffic, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=download+bhagwat+geeta+in+english+pdf PDF link annotation
    • https://www.ftha.org/admin/ckfinder/userfiles/files/19692995919.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/64112128925.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/nifiwotunuvoliwana.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/882956191.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6d7955645c4e7e08b66154215c6bd9e3/25260524282.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614b06e0e36e9---pelizafaluve.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/77877021534.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/19803365457.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1632470246.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/domufefuzot.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f460dab1fd---sedubezupenobosewinibog.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/gumirepedusobixu.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/15574443854.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/bdd4b4a1cb589ec491d12206a033285f/42371029724.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/wirafuvu.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/monaj.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/8557413770.pdfIn PDF document text
    • http://ippon.lv/uploads/File/wewogepesowedivitosobo.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/56721770911.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/sodikefiga.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/36d4686a3ea2605cf8a07a0c8e8f0537/83241584281.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/54996413581.pdfIn PDF document text
    • 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_off0000c220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC220 19132 bytes
SHA-256: 373cc5fdc5d418c8a8211f8a144d3957f97dca651a8f18182fdc0f35395ba67a
font_01_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 10904 bytes
SHA-256: 7436c2dab868745a17f9a16cd524b974a7c14b15bfd7be89254c1c0ecf224fac