Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7370ccfb9c00175…

MALICIOUS

PDF

93.7 KB Created: 2021-08-10 20:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebc31178d221538c559ea47ebbfba3a7 SHA-1: 657fb49bdd7162b47433463b1e5d7c4053aaf5a5 SHA-256: a7370ccfb9c0017561c5ac33f0bd09ec9275250de3cb790691840875213f8203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the links and the overall detection pattern indicate a likely intent to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=how+to+squat+with+weights+female PDF link annotation
    • http://roweryelectra.eu/app/webroot/uploads/file/16215160789936.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/10669531708.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210707062731.pdfIn PDF document text
    • https://fallsplat.se/file/49482635924.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/94778793241.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45f3f29da---wafajimege.pdfIn PDF document text
    • http://gabortech.comadmin/file/85156042742.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/rolobijezojiw.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/nobibuxumorirojovu.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/zolozudidugemifi.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/mprqpsfvnljmqog6d9arpl150s/kusavesujafuzubafufe.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/01589823d8de6fe1c507d8c5dbd5c66e/mogutapifij.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/negafukujikomoperi.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/tesagawuzujexoxovibugobit.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afadf4e52f5---54464629041.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99ae40de7---tejotololeniwomuxoreji.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088251abc004---bujozasunavozodimovu.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/gokuleweranidejinesup.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c07464405d5---70705455484.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f066a55b38---72179710410.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/33984422429.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/79550652017.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/65578215523.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r77rg41qqub1akdd1ivt836d82/topol.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/spqmd222o2gobv5r8r2qmuvq50/22007052011.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_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 17764 bytes
SHA-256: 03185167633451bccfa3699177a1ec8d3c83b37e02a46d3fc0fa885d2c9e7ab9
font_02_sfnt_off00015056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15056 10780 bytes
SHA-256: b26b8b6be9df2f27da40c9fffae912f2508571c9fbb69375ffbf5a455b997b79

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