Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a746ecaf53fe348…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 06:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2aee11ca5c39d97bb4483ecd450321d SHA-1: 542e158532e35dfb060bc197ef58374b84500df3 SHA-256: 0a746ecaf53fe34863287648f9a3f87dd9ae1943c1916da23edd88cf91d70f67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially compromised WordPress sites or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed for SEO manipulation, likely to distribute malware or phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=offline+games+download+apk PDF link annotation
    • http://hum-lucknow.org/test/fckeditor/file/44733726029.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/wibawuroxunuxizijujaf.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/74010113805.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/rikikerupimefipupa.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c04eb3afc---zefejejarufarite.pdfIn PDF document text
    • https://everestart.com/images/stories/file/31918027074.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/58092366476.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/93284871747.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/87425411350.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/84786751704.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/10/38093539627.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/bigujikuremegamamogedis.pdfIn PDF document text
    • https://dm288.com/slicice/file/77486534262.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/mekarefaloromit.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/zimup.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/liluwun.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8bf1a7f743b93a54a4016db543660a92/35441836196.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc7aab9c93---xitopijukelonirut.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/bunewit.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/95439421553.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e038051c1384a8fbc7f9723f3d8d862b/gumixoz.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109042033141860.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_off0000b37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37F 10844 bytes
SHA-256: b8067bf3416c018488382ac14702e40e325d1fb6f4fc3bf8d1b7e3e47ac198c0
font_01_sfnt_off0000cc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 15308 bytes
SHA-256: 6f63121ac7c695aea64d1d8db7494abdcfba58fa24e1dc76f8cd3df6230884ee
font_02_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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