Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7944783b475a2d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 10:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: feb76d70be526f93ba1ca1e114a1cfc4 SHA-1: a6bf514c8729f9dc39e294bb54bd7e943cdfb765 SHA-256: 9b7944783b475a2d78a52b12218c6ea2b1c236038a7878bd96edb1718629004e
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external URIs, many hosted on compromised CMS platforms and disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or deliver a secondary payload via the embedded JavaScript and linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://synerhu.ru/uplcv?utm_term=martindale+ebook+free+download+pdf PDF link annotation
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/4458540000.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/fesozut.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e4d0dd0afc6a15cc1a3575da61c6d86f/lapejimudukaba.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3929a3c3b---35268786386.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/suguke.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/2f6ff49705f5a875c109794ead0919dc/49190983682.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/genorixewibo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6771f34317---15558769124.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde1b56a0b---39520778686.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/bavegefo.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/riwuzexunojupat.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f972e393---jibinigofifevelanosenep.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abef1f6f7bf---taliwadulomozogijizi.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/tarod.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f94ef08995930c2bf489e6e540ad116a/ravademapuzot.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/ferodebaniwo.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/94378167697.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c6dce6f3bea9d8ec469cc8b84bff1655/temimubakopivogajasus.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/37053803994.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/17722617956.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/bf3c31567d539117575a25db024e57a5/45727140801.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/gezuxipa.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b8cff01ee2082db5f4667fc7580745d7/paxekuxozasenexif.pdfIn PDF document text
    • http://jaika.in/images/documents/files/7109619975.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/ramekijusavoletuk.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa048b1a202---ripafa.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/fovuseriroguxerekejuwex.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_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 16696 bytes
SHA-256: d4a9c5f1706804999d113b2461cd7dc2f4f9a6686b79fedfcf88099a2c3c42ec
font_02_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 10632 bytes
SHA-256: e28ebfba56e8681e3d1d4769aef1b4ab28765415f798f24244633686d2fd82f8

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