Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d27d1538d8497a…

MALICIOUS

PDF

88.2 KB Created: 2021-09-03 14:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0cdd19a7ead64e6f46b4263b097bead7 SHA-1: 77f9caad062adca94410ff07fa6c219f2bff5942 SHA-256: 70d27d1538d8497a8a473d0bdd2822100428283dbe9bd5ca96edd39eebd83169
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document's structure and numerous external links suggest a social engineering attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tadimtursu.com/image/files/getiwunilaro.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2e1076a6---valigasowe.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062319222373499.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/80193900904.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612804fd3ab7e---13815804339.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/44245055665.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b9449f6fb9187d85d6ebb327977bc712/42867309595.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be84b29ac01---84562936073.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/rosagegokato.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/qp01hr9pgegp3kfvnupe2g61qo/41223210194.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/xitopuzorafaxenulirugi.pdfIn PDF document text
    • http://esejsc.com/upload/files/bevirepuz.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/23193577356.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160811dc671506---rodinuzifogixazixovot.pdfIn PDF document text
    • http://fkhd.cz/data/img/91067897690.pdfIn PDF document text
    • https://ubranni.com/uploader/files/teluvizoxogukofetopefaj.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/bokazadamopi.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/84736623906.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/weritepanaxa.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857ce1d0de8---68299116111.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/77018350381.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6omfta8kv7t7cpnfv9mcf80gp6/xuxasudodivorapumudutafav.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/14446560067.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/16641455456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=packet+guide+to+core+network+protocols+pdf+downloadPDF 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_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 18712 bytes
SHA-256: a082ee7dd6a1c271d2a6cf43a08e2b89232f5a731b0a35d24587c836037db814
font_02_sfnt_off00013871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13871 11076 bytes
SHA-256: 9acf4401c965550041b6fd325101be0f2af92305316a33c0bb1e24f47db7bea3