Malicious PDF — malware analysis report

Static analysis result for SHA-256 063ad82533d2f7b3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 14:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 141bc89fce7c4bf1be5d0551ea72cb80 SHA-1: 2977b906208d518a42a56ae99b4b9b306ef84d6f SHA-256: 063ad82533d2f7b304c05476cceb7e262f417637b37e6130329c1797b452e9df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or are structured as link farms. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=sky+wallpaper+4k+desktop PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613791d09f6d1---vositakakewebuxujegifiko.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/58987187304.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6f47effe---24365034800.pdfIn PDF document text
    • http://isuzuphonoi.com/data/dulieu/files/lakomosaxoku.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/nibewisibil.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/54208632431.pdfIn PDF document text
    • https://limsurdua.com/contents/files/xevijim.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/7331647957.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/rorinejolavemode.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/levorijuzamu.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/48595704136.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/75783568213.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/auej0sqbaaik0fph25aj6ctglo/wawusirumaxafekep.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe05a9eb97---77921956362.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/bopoxopemafatofuzezije.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/98557848701.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/12461619896.pdfIn PDF document text
    • https://oferta.lt/i/File/4317165488.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae3805014---ponisuxepetuzikaxu.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/20188491843.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/14715487965.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/39480995447.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/silezot.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/63116184029.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/mimojevoresak.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/61170408630.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/22813403286.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/kotopotatuxuwimugera.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_off0000c3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A7 17864 bytes
SHA-256: 915a4247c678cffce0e51e9c1b7d093ec5befc0d28bcdd6fc87c96a23bccdccb
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10636 bytes
SHA-256: 4e18a10f1c8d1d998543352b04ebaaa65e28695266fc4a9278273e1437c2ef14

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