Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b6c7cb14c340e8…

MALICIOUS

PDF

95.0 KB Created: 2021-08-06 15:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb844537ad73b0bb9cd25ecdfded8ecf SHA-1: 2151d2bf2fe206fe9d56f0ad271ce5af5fa2a288 SHA-256: 69b6c7cb14c340e8b619e2ba06e4d480d010130cd3b715f8325cef742b89e14e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely for malicious redirection or SEO spam. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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.
  • 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://sieuthicayxanh.vn/webroot/img/files/figegapixusivizoxe.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/14862458865.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3d3a4f4a8eec9df34ab66cb338e29fcb/filagiwasujew.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/67692416334.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d45c1b5a0cc---54943731976.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/futujerama.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/86266703186.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4515999063ffb02ea8ce2c147097a12a/vafazorito.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/sevesixolomutate.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098857bc7c05---jazulamigitumis.pdfIn PDF document text
    • https://renault-service.com/userfiles/jepuguloz.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/lenenodalofileranagabaw.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c4fc7b3ba1a1b7cf213f1c5bef53913a/besejarizotud.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/14743907922.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/13948701127.pdfIn PDF document text
    • https://codecs.ro/images/file/15180056615.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090d94e819fe---rukezanijetumegovud.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74d9f3cdc---22688854530.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061504481391.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/82216008255.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/labevajanudizod.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073273f5693b---tomafa.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dajumuronurulajufepoza.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/8548805631.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/ganijufasiweximudizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+know+your+perfect+foundation+shade+onlinePDF 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_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 11100 bytes
SHA-256: c630fb1920051a454b517dfa27df8fcc1ea91f660d2ce5216267b593ee723cb9
font_02_sfnt_off00013b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5B 18180 bytes
SHA-256: 42e6d23c17fcac96eaabad3ed5fa4dc842d9ee75effd1fc260970afa966ebf4b