Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b05a0511b429f1…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 08:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c1acd559d0ee941a533ddf57e6f8424 SHA-1: 2427fd0277bc3141be804696e1e579bbd10e1c49 SHA-256: f2b05a0511b429f181d03f3d97afc8ed22d76d27b70a90c1556338e3e22733f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, but the primary attack pattern involves directing users to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/df7ab69c06ff4308d57d79f026caa016/bubodinudixijedak.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6281fb75e7---5080090821.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/70525466432.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/m6pjdj9cf5so7lrk52grla7udr/sodagokobobufot.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/94825042172.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c998f59da89---3338109516.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/fizutedumatatipumupajami.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c68032382---vaxovifisewipepifave.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/68893756049.pdfIn PDF document text
    • http://chipgene.com/image/files/20210701_090307.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160affd9ce1a25---51162600856.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/givurogodukuripopu.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/93659191951.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/fapapufebunudo.pdfIn PDF document text
    • http://0930actress.com/files/files/numulosumasupawewovoj.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/70108331062.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/92324457663.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/xefadabinaxafokoliperonu.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ddedfbd82806735354269a4a9ca00210/gisiw.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/sitejuvafapezanopuxuziwos.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/43430744884.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d046855e0---wegaboderesukubapovodop.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e7c1732d9---vevabuvudopigilaz.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/85326353230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=addition+and+subtraction+of+decimals+word+problems+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/zibete.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_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 17296 bytes
SHA-256: 0f4b231ea6f56e4b9a8e6b4237bdba24ae29ee9ecf8d2e407c8904d71bebef1e
font_02_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 11088 bytes
SHA-256: 03b5c938a47874a2967a0ed3b08e7b9c49792d0035bff43112a83260f5393116

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