Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ece3f880dbcbba…

MALICIOUS

PDF

93.8 KB Created: 2021-06-30 06:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bbc48e9a95dd6a207d2823044f2b2f2a SHA-1: b88beba4d4ccbf026fb01dff6363298d0bbc72e2 SHA-256: c4ece3f880dbcbba7c1b24ba4678c69bb07a74be3bbdc616ba6fc0e002065aad
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating it's designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the link farm nature is a clear indicator of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=questions+on+sum+of+arithmetic+progression PDF link annotation
    • http://geyikkimya.com/userfiles/upload/file/mejaku.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/sufemegolupata.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da7d21410---8503598897.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6421773a205723de83b4187e1ad56c36/8734443629.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/wevozu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/71210374063.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/86070187250.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/tazipifipejopuvoboxet.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609475226642d---vibede.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/78538450428.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc1acfa15---ruxagesutar.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9396e5b1---71833620258.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609c150d6d323---61700857808.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/af4f1291ca9a39954090acd4cb81d22f/vogutosakibotimokiwades.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/433af6770b426d0e73364685484013c1/49049468938.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30425267736.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/n29st85k1kh3glooc7sfdn5qbk/8773258256.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/tojokolobogalem.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160763e5717cda---23508467632.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/65973814402.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160732561eef5f---muzeletigoligalarasat.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 18976 bytes
SHA-256: 4954f0fdae0dfe428fc0c811a1bda2f37cd7fc495f23a2e14bd7bfc5c9945585
font_02_sfnt_off000137b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC8 11040 bytes
SHA-256: 0f1ee1df7af55a0f40ec5a73016c537b713a0b9c316c20ec717232a0f0840efb

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