Malicious PDF — malware analysis report

Static analysis result for SHA-256 408944cd877bfcf8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 19:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f9c67034dec2352aaf0fc3daa240188 SHA-1: 8a2dbca7ca8ddaecf395f83afff6764a3803b57d SHA-256: 408944cd877bfcf824972dbe166cc27a5059fe5861586aeea003a6071052e998
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many external URLs point towards a malicious link farm designed to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://allytemp.ru/uplcv?utm_term=interesting+facts+about+christopher+columbus PDF link annotation
    • https://rajatotogroup4.com/contents//files/tegixefedi.pdfIn PDF document text
    • https://sharenkon.com/files/tumosowokukuxusowoduxuj.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/66399449020.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/nirakila.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/np2cac07s0h5udhmnderh5f6pt/62761011897.pdfIn PDF document text
    • https://angkalaris.com/contents//files/20097449861.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/limoji.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/rapigezereludix.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607affd7dfb3c---dawexaji.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210715201532947.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/74184673935.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/96baf635acd330837405ee7f36ca35df/rovujo.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/39884303798.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/iojhs5dgt9a70v0ce1cb7jgim2/xumiletidowafugupi.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/logaxumepodawisabixusi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ostlgh28h4lkpdlktnus8gb3k6/73844724194.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/97847778747.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05cabecb9---pipenodufuluba.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160facdf393e41---23138869875.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/nimapumejivamu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/573ce77e1be3e8574a2352761dc5d72a/95925444506.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/wofetagefobogarazidebisup.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/raxonavukazoxeveji.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_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 17244 bytes
SHA-256: 209bf5ad9e71d49998c4687dbe1c5fb9496d2cdb3241f1f400e998d9f1b080f0
font_01_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 11120 bytes
SHA-256: 138f2c9fa3fb7a670152192abb60836cda652ab1bfb3d3a4c2f0fdf6906562ad

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