Malicious PDF — malware analysis report

Static analysis result for SHA-256 644dd5afec9ecb8c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 17:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2cea678b1a88f94fb620371fb8042b2b SHA-1: c64e028357526991dec7460b63e702726e35838f SHA-256: 644dd5afec9ecb8c85bd5e6861cd2927d9fad40d7e6865aba1a2ac0b3f9fcf58
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous external links, with several pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links aligns with the 'Malicious Link' technique.

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 http://diagnosticaedilizia.com/userfiles/files/nuvebojelenulu.pdf In PDF document text
    • https://synodradomski.pl/userfiles/file/jivuwen.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/64386980986.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d527259a91---rasolamuj.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/lujeparoxufefukujonel.pdfIn PDF document text
    • http://rcmo.ru/upload/files/tejobam.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///denalezeri.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/xuzavigelatadavobefamiji.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/gakiriv.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/bepuxakewowekew.pdfIn PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/57713252033.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/29568962363.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j18sc8rllhp2rn4uvq92vsvotb/96800791863.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/gewivuferowilir.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7820ec47---dupabonutisufepifalupitu.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/74964063623.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16088fea8c8177---pesijumidikuweve.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/jaterevoxoraronironibe.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084242e44983---vaforukeba.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/96991915085.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e7261cd2f258f6555b52d83548101695/disufisilidif.pdfIn PDF document text
    • https://asiajitu.com/contents//files/rakusetuzevomuzawaxutuv.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/64c567f2cb84eed264a9acb0901f435b/seliget.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090b52c5b9e7---rugekajegijazadefabasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=messiaen+oiseaux+exotiques+score+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_off0000bb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5F 16820 bytes
SHA-256: 3632ba24280b96eeab92bdaccf3cfbe6d222bded01a77c952fce215862278f33
font_01_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 10908 bytes
SHA-256: aee8e2869362c3629770067193d2b1954a8d438793c7c988efcad711c4525f99

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