Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5393d5fd4ce3adc…

MALICIOUS

PDF

93.8 KB Created: 2021-08-25 20:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c169bc0a17b56fed668a7783bbf8ece2 SHA-1: a9a4f232b097054797dad09f74cd79c6e124929d SHA-256: b5393d5fd4ce3adc5990bbd875119fbf1d5c102078149646c165b44257f5cfdf
164 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ae03cc558---59615476528.pdf
    • http://daegyung.kr/userfiles/file/20210710104951.pdf
    • http://zjqzzx.com/uploadfile/file/2021071708040273499.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f6dccd40aa2381b89a64ffb980cf12ac/17805890401.pdf
    • http://ddaengshop.com/ckupload/files/96448578702.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8759e8c078---bowuzebavupefoxo.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8d6fc745bbb8c6dfdd8ddec3f225f85/xivuveremuwilobarabad.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/munale.pdf
    • https://bevelec.com/bevelec/dossierMois/file/godosoberepuvuwi.pdf
    • http://netshopnepal.com/userfiles/file/58825706468.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/dikedidajuwoz.pdf
    • https://skinrepublic.vn/webroot/img/files/57729699140.pdf
    • https://bustotoronto.com/userfiles/file/funid.pdf
    • https://aneri12.cz/res/file/devuzudodav.pdf
    • http://merwepizza.com/upload/file/68344072510.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9fil3rre49f27c0g3btfc47pcd/89612437235.pdf
    • https://colakcivi.com/userfiles/file/93142295441.pdf
    • http://www.examnotice.in/uploads/files/60362661546.pdf
    • https://apsco.ly/userfiles/files/79975887046.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f03ce38410118554d2e1176491d902ae/tutofusanepigupuju.pdf
    • http://kutyasturak.hu/images/files/vepegufajofopa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=brown+and+white+tabby+cat
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/88047527f8bf36cb8f34f3e4a143bacb/loxonorikivojomiki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 16792 bytes
font_01_sfnt_off000120cc.bin
376aba8724a6cc2f418d6b73b225e64a6c358fd5e5f4a10664f574ef602e3222
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 18672 bytes
font_02_sfnt_off00014f81.bin
fe3cab1d68230121efa68c8137c07ddda47e760a2bdd5535b8795d94bfef3860
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F81 10648 bytes