Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c667b090bde8f56…

MALICIOUS

PDF

95.2 KB Created: 2021-06-26 17:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4765752b08923693a5fa34f054c81acd SHA-1: 5642f0f1bd8844389d7e45e3d64f00816d7f4b1e SHA-256: 5c667b090bde8f568f9db496b0209adfe2d542074a44e1180084ed166638e828
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document's intent to trick users into calling a phone number under the guise of resolving a critical issue. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=clam+linguine+canned
    • http://shuimotongyuan.com/userfiles/file/dotekusupegokejidaxubit.pdf
    • http://acecaalcoy.com/userfiles/file/bexuwuvolavag.pdf
    • http://calisnt.com/uploads/files/xajexaxerukokozeputalad.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6edc628fa2---vevujomo.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4f00edfb5f73eeaf028406e6fb75419a/77073106036.pdf
    • https://gachbinhduong.com/upload/file/51055433505.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/lekejik.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/nojek.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7806d26d0ff0a638f81bc39f289f44ef/93853856148.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6bf3934a7b516c39ea2514acece2e05b/88688133614.pdf
    • http://vistobrasil.net/uploads/file/zurirupopezaniteg.pdf
    • https://calmoinc.com/upload/editor/file/lozofa.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a951daec0---nopebexurorevena.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/cecm8uic7h6ou8svl5oid8pth4/seripapox.pdf
    • http://aelma.com/sites/default/userfiles/file/68293029401.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff166f1bc---36745494235.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cc780efd---lojujuwebufugazoku.pdf
    • http://diamond6ranch.com/userfiles/file/nizinijiru.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d9e082264---85060407119.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q5fish05s5np33j3jkibe2h4a5/sugerubater.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079390f5158c---zemasuxemitilazitefirola.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/82odkbu6edff57jhj3ljflq5r6/18947616379.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29571c8e46---ribavu.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/894c30a456153a53493f51816e7b131f/vijuti.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/752a0191148691e1e0009a9a3784d429/66074320313.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/tamadejufal.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe0.bin
1ba4b1398a9e2282067b3d9efd4042ce3826c8d14d4422366b88d47582cd3217		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 10356 bytes
font_01_sfnt_off000112f4.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 16092 bytes
font_02_sfnt_off00012835.bin
0fe9f658b5d806522d2440ade2abae06c787d6dbfb8401c85f51891d05bbb0f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 17880 bytes
font_03_sfnt_off000156df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156DF 16792 bytes

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