Malicious PDF — malware analysis report

Static analysis result for SHA-256 751037c57e62f6b2…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 18:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a2ebb5393c27cda54c47b4dbc1401ef SHA-1: 9a305df5e91f12e0942ba82322ea14dbc097a973 SHA-256: 751037c57e62f6b21c6050ad20a31ad6f8492c9b94f08c95cb8debe074d8c48f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it impersonates a document signing service to lure users. The document contains numerous links to PDFs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or credential harvesting attempt. No scripts were extracted, but the presence of external links and the overall context point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354ce59c5f3---vaxilopiju.pdf In PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/busisosumesavofu.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kujorewifi.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/28372604682.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/jatufemarajemib.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zezatipijelapisidiwa.pdfIn PDF document text
    • http://alptw.com/images/files/50165969021.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/ralixisegamod.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/ruxoxafazegitigez.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/gelulawi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161321ba08db55---58996840242.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/tipoza.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090411115473499.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/jepevovejebanorufifaru.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/nakizovapux.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/2897349297.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/77991390577.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/69175763502.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/javixelafab.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/56643322874.pdfIn PDF document text
    • https://inarsindbari.org/uploads/mobezalufiwurivedadem.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kpvopvmb68fbvcnulebk8un7s6/lidujopisawajazuraxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=adobe+acrobat+9+pro+create+editable+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_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 16936 bytes
SHA-256: 709dcb8c8a074efd2bbbffc2f3ce39dde8b7f22b28a49a82575a869c6667e0ab
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 10632 bytes
SHA-256: 01b0902142a0f989dbe546a233088dcfe419762d974ddcf7e14c1b85bbfb984c
font_02_sfnt_off000114d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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