Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4124a6428dc190b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 22:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 957dc6c97e6639de5095537e15ab6b17 SHA-1: 2631af439cfa913407b75efa34852604df6c41f9 SHA-256: a4124a6428dc190b061ed52b3e9bbe3a9eb4437577814cd3bd7d0db53f99aa6e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://energy-labels.com/userfiles/file/kidopifudexezafereper.pdf In PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/1237999260.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/50078520961.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fa14441eccfb10ab2f6e19158346439/josefazatoji.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/gekabatavemalubaximapedot.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/fomekogonibanegagakomanet.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/93406622516.pdfIn PDF document text
    • http://manu-transport.com/documents/file/53522511104.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/31fea45c317f9fad7f88bd560d49ff25/kuxemidefakiwifakekulus.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/27568182137.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902110930.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/dawuxutaxibebonoporawanat.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/bukav.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/59088182514.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/64504535356.pdfIn PDF document text
    • http://analhospital.net/file/files/gubinitirevokanuwumuz.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/wagitod.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4341a1553---kadaditexugarupa.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc3246ebe---lukis.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b9b5dbcdcd242359462a11cfe10e55ed/duwarenalabukukel.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/muladivoxevajugozozu.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/88124237812.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/zezutavixuvitogunesasutuw.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6a275dde1170f62426a4de40ced7798d/tomilinus.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210907003804_nhlczl.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b2b0efa35---jimetexiledafitulex.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/54315072167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+manga+pdfPDF 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_off0000b700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB700 14844 bytes
SHA-256: 0724a3e4ae39c7be7568de756916678efeee26209d9682b3b189a680c7aaa44a
font_01_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 10428 bytes
SHA-256: 7a042847f9b6cfa2bf25781bfa890d5b3fd297b15e653d62917fcb4a9f677868

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