Malicious PDF — malware analysis report

Static analysis result for SHA-256 4025bcccb4ede2f8…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 13:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a00065a7acf9562ecd718821db0df6c5 SHA-1: 2c295fb4cc299c3742b62c56e36b4f9b6b0985fd SHA-256: 4025bcccb4ede2f8f7a999d6294f3c722624147edd80606b53f8b1708be362dd
236 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it acts as a link farm pointing to compromised CMS upload storage, likely to host malicious payloads. The document also employs a social-engineering lure, prompting the user to install a browser extension or update, a common method for delivering malware or stealing credentials. While no scripts were directly extracted, the embedded URLs and the nature of the heuristics strongly suggest the PDF is designed to exploit the user into downloading and executing a secondary malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076297be92b1---86661818918.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pqm894h7mok3cc519ji6hrs74n/39498628346.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6e4ff0645327b5721f445a5d2cd45359/22765309989.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d31eaa75d---koxakirowivupunalapuvo.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d6980ec0---16407178874.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8c79aa3e---65324562252.pdf
    • https://ayurvedaemart.com/uploads/file/99879677492.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5cde25655---kavewowugaxijetonokapago.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/99607a08b0642916212e0039eecc102c/44703209263.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d155932d---gejasigalinigidilo.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd56f154f---venoxovumiw.pdf
    • http://www.annaleehuber.com/content_files/file/ropejobe.pdf
    • http://gianniarnaudo.com/userfiles/files/vazekavopiwixesebulite.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/i0o6nglc3gb4rlm05nm7alb564/14761239684.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccdf141d25---tifobakidevi.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/sobebilawutekobevudodoma.pdf
    • https://alamansyria.com/userfiles/file/kegod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=deal+or+no+deal+download
    • 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_off0000e6d6.bin
d490562a8d809a952ea1c57a0dba6e3533e83f0b2768c9d2eca66f41eabd5f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 17284 bytes
font_01_sfnt_off00011396.bin
978b53160de35634594b4ad678f3a677879fe315a8a1d4d96e4dbb15a83c3c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 9968 bytes
font_02_sfnt_off000129c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes

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