Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5337f59d9b54ac5…

MALICIOUS

PDF

69.8 KB Created: 2021-07-02 11:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 02c71b3d61b4ffa24ba8a5aada8a2511 SHA-1: eb7a48377e1d47bca7d89850d4db5397232e0a05 SHA-256: c5337f59d9b54ac5a0e545646c8a5449bd7ff09dd9d216e1f82530d87a415638
156 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 heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely lead to further malicious content, such as phishing pages or malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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 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://entone.es/wp-content/plugins/super-forms/uploads/php/files/8360d82cf859550ef3ea2d5fac7e2568/78250684649.pdf In PDF document text
    • https://marblobaths.com/app/webroot/img/files/13191405107.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9a073b3a0---basofeselaxuniruge.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/49674312627.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/zorejetunuram.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/lofinatedaxepeba.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a109a0evf6csm0o285b47vlcu/11492760842.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160debd941eb1b---50166317275.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa52a4ac8---silaraxasivojewir.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/33407002592.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9daa4e31d917ad7ad3a07b63db44cfb6/feposu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/40254979173.pdfIn PDF document text
    • http://belst.by/upload/file/56402134797.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e40a1874---55332686788.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7c902684797f18a8bb53c850414434d7/rojugoga.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/51a20df376640ec7026a4927ac7087a1/5950147398.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/55285230164.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8fcdfeb7---sonisiwokawofinila.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e4e72a5931124d2937d8a7d4f15034dd/bumabol.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/jetinovufikomoxe.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/64866632071.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6fbe9764886d1ed9dbd7588ed7c53daa/94354743872.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/913aa55fe8f0c0a7de77dbf785e94ce9/pufuwagakufuru.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079f59947c77---kokuvimor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=frontal+sinus+swellingPDF 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_off0000b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57E 10444 bytes
SHA-256: a02f4faf3819e4c8b62e4edd6e1ba877f7fc7094172ffc2f100f34b73007131c
font_01_sfnt_off0000cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 14516 bytes
SHA-256: c6e514c2692ab40c0022fe00d81b3808be535e6a0ddee034b123f5ddca981d26

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