Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e922ed2a041254…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 10:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e42ce53e770b6af013946b25c8839b5 SHA-1: 65f2560fdf2d2144e8268159c9f65ec6f99b3bb6 SHA-256: b1e922ed2a041254c6208fee4dffa920ff3a613841f2bba024d458b59cf4b6ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, but the heuristic firings and numerous URLs are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/gk1fdj3u3h6hdv17had66ke052/wuzopiwazolise.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bdf29e0ef---nigap.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15773613449.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/mowobekezeno.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a5b02bc8---66326164357.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/96812306998.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d01630cae---jogapodebimaxoxedozovi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/xazevevixilujonu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/668a132f5d6f193474ec6ac24ccc22cd/zepuradoruxilekibivuj.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/ritufalegunofibukuxibon.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/79331664324.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/24450810053.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/233e6cb5a015b96ccc38efcc865b4dc4/37055390881.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/kububagedikamoju.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/zusuralilo.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/nopefigaripegazemenifovu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lv7cnj3ggf49gpeeap23m70gvf/93873019162.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/vuwemige.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/tesodekixolabopifuz.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/866583c70979d88c327ef7fb40a1b12d/27279577387.pdfIn PDF document text
    • https://actor-conseil.com/files/file/dejisifiduwe.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/t8ii114s6vbc7d2e74chg11fm3/55781839663.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/21289422446.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/bafavidazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=induction+motor+interview+questions+and+answers+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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 11084 bytes
SHA-256: 6dcd160d48087f03b675ee31a544edffa5e06179ddd22de8c87eaa1abd6515c6
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 17452 bytes
SHA-256: 687428960e089593b0a722817e3d579f4ca4b92b0ec6782110c781c168592bef

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