Malicious PDF — malware analysis report

Static analysis result for SHA-256 449e74c5c7be97d7…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 14:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d16670656ff453c4b8afbb1fe526cc9 SHA-1: 08dd1ba51cfde1b54a1181075588d7809154f13e SHA-256: 449e74c5c7be97d7b104f7c4e1b87d00abb81c9317feae63cebc700bab3e8b9a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly indicates maliciousness, and the presence of numerous embedded URLs supports a phishing or malware distribution scheme. While no scripts were directly extracted, the structure and heuristics point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://gartenstadt-apotheke.com/userfiles/file/revurutupifom.pdf In PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/13403998561.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1c773b0305de0e6e9523e5fa790c776e/taxuzorowuvaz.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170e7b1089---zemiv.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/24777456021.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161356ad73adf3---55237318278.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c3211ef4---70507359883.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/36079708312.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/89306690504.pdfIn PDF document text
    • http://imaginove.eu/data/Files/72026855069.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/gujer.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb242d71f8---48728092229.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xogojajemonizoponosepidef.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/10052168472.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/mopagodidobaleguxav.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/8520837720.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/1103461894.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/wuxefevoguvigoru.pdfIn PDF document text
    • https://pokereshop.cz/data/file/6678154423.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613465c73d6c3---17685455957.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135d903a46d9---64504657775.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/80594114039.pdfIn PDF document text
    • http://underbutter.cz/download/foto/wigupegobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pubg+new+update+2021+apk+downloadPDF 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_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 10920 bytes
SHA-256: fd9d3d604f95a7481a6a3eff0a650e76d40aed1b29ba48d7a9928b7cb6ef14eb
font_02_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 17460 bytes
SHA-256: b8fe4e8d9c49594c4a55cf4330ceabc0e0efb84e8749f97c311aa94a0062be49