Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ecf5fb7cb8c4f7…

MALICIOUS

PDF

87.4 KB Created: 2021-07-09 15:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5355f42fb16e0b08322f90b16de4e1ad SHA-1: 6a3dfe23ac9a9790cbd0fd4f541fa20a54ff9073 SHA-256: 37ecf5fb7cb8c4f7e01e090a0177d63588e8d4dadade0649939c81005e05b25a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised CMS upload storage, with many distinct hosts, suggesting it's designed to redirect users to potentially harmful sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa40f8c75449693c363dac33c0732884/nojerarifuwogewesakaxiz.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8084gg4huldekii78cahfrso0v/sinopugi.pdf
    • http://midel.me/userfiles/file/voretusafiziziju.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e4a2686735f0eaa2ccb526a2033bc753/remawobonolezukuruf.pdf
    • https://moscowfashion.net/content/xuploadimages/file/buvesi.pdf
    • http://architettorobertafasola.eu/userfiles/files/17607032125.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/tanomonaterukili.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160929a9d8a450---70825542982.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e517524b09---wonekikelixubix.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785d6ee7b18---lolasoxoxuzenole.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/736aa368f484113c54b65dd8778f79f7/31940593060.pdf
    • http://www.cerel.eu/images/wyswig_images/file/9812325187.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/89115359225.pdf
    • http://chinasoftcore.com/userfiles/file///kumutomobefasobi.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2df463862---makuzakuvejemorasodose.pdf
    • http://axwelindia.com/uploads/jopifu.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/46930460600.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa67780ef9---bilomonejilezikobefukatu.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ebf7a9faaa7d7d14d0dfada3fec39374/godogibojibogifom.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2e4fa5a4a9515cae287d20c108163914/38688724004.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b51b4851---42747340779.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba335605f---76031856459.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879a5767172---11465070466.pdf
    • http://wadirumshootingstars.com/userfiles/file///40255469205.pdf
    • http://sportsgarten.com/editorData/file/32091628821.pdf
    • http://masterref.ru/editorfiles/file/pefabafiv.pdf
    • http://costruzionibulagna.it/userfiles/files/ropilum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cognitive+development+in+middle+childhood
    • 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_off0000f2b3.bin
f586df120cd953a44d4b1bcb1d0ac53df604917baaa5645e8873c056ed0f8239
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 16708 bytes
font_01_sfnt_off00011e26.bin
948aa7743d9edd3d0ef27336311ed171b4e8b6f9511b7635e7907fe59adacb9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 10628 bytes
font_02_sfnt_off00013611.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13611 16792 bytes