Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fc6c0aee9a942e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 19:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 631e9b0d6b164ff8d7fd81913cd422ae SHA-1: 7688e15329cbc264238f5d5160aca5c9e94154c7 SHA-256: 72fc6c0aee9a942e3b00b909a0f0a36a240967da47e1903d3ac72c333fc4db86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://vipacademy.org/userfiles/file/55559506694.pdf
    • http://moiarchitekci.pl/pliki/file/84950433957.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210906071956.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/60930124485.pdf
    • http://ort168.com/upload/ckeditor/files/dukorivapoxomuziter.pdf
    • http://mastervgtour.by/var/upload/file/17970360061.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/99942888229.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/89699ec77b9b2d95db2fad11f52babbe/40381386495.pdf
    • http://namjapizza.com/app/webroot/files/vokebaturugusewit.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/9e8sllndgfav3dqkq43addafmu/92099735897.pdf
    • http://landpas.pl/upload/file/35712135910.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e314348d---wejirujunokoxiluxa.pdf
    • http://ctcinsulator.com/uploads/file/zemotubuxibejiwajakupa.pdf
    • https://inprovitmexico.com/ckfinder/userfiles/files/96520835189.pdf
    • https://pianotuningdarwin.com/userfiles/files/kexawemawojak.pdf
    • http://alanaf.ru/userfiles/files/numoluvesexijodajeriso.pdf
    • http://files.ibiza-ferien.de/file/xobafobaf.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdeb2f1747---xikusagupupagurat.pdf
    • http://geo-equipe.it/userfiles/files/nutetuzudadewad.pdf
    • https://mangonebike.com/uploads/file/76020499512.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/visorofezefifiwarigazi.pdf
    • https://bellcera.60km.com/upload/files/90165884125.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/76670664156.pdf
    • http://swaptoys.org/ckeditor/uploads/files/20961418.pdf
    • http://retrofotr.cz/files/file/8307073698.pdf
    • https://balticstroy.com/uploads/files/rikiwadebo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+android+update
    • 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_off0000e4c8.bin
53469d63feb5a445c2e358b0fc4cb9739df4b434a98723d66bdae82c4b186739
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 18440 bytes
font_01_sfnt_off000114d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 16792 bytes
font_02_sfnt_off00012cef.bin
e9ea781460d24c2f7c5a63c4f72c0d327c8fb998db09e7fb811900e9aa48f5e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 10248 bytes