Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ca991abd197976…

MALICIOUS

PDF

114.9 KB Created: 2021-08-07 01:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e08849b97b74ab2102d82c6070f68c65 SHA-1: 1567ee24bb350da772f6e39cd75021f5a548658a SHA-256: c1ca991abd19797692bd4d5351c090c094a4a714e4a8cb1fbed52e5d58ef2f1e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised CMS upload storage. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/aa9b15525962538b6bd49747d5f58f16/dalemogukopajizojenujepo.pdf In PDF document text
    • http://www.siposferenc.hu/html/winiretibutobekafebimo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/eektbhoe5i5hqtpu8qs2sdaro1/83324341312.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c7c3c450---77724216643.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/99e248987b2e990e5fd45f2eadba0c25/vitajexupibukufipuvex.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161002aa932aef---livagifupekijeluritow.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daeeb1a2a6---41277801651.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764cb3228df---lamebinatoz.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160801295354fa---50886678604.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210706_B12912538662AD7F.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/9955043107.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/mepatizibigepunawud.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/97ee0b67fec76635389ff5a8526b6b6f/wibalipur.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/dubigedarupitexuw.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/apt9qn1e8v3ck8dvubqedv4an6/39936057356.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/49ee4391890c9398e1c94e675d5a821e/vonaladijizeri.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/xewulewolalupuz.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/572e737748f5144562eac7b09fb4cb88/repetunosetosarurorulol.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/80f77agjt897gv3oc4ve6btsc5/wuziliwobizatixenewow.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2044e054---98859075260.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076f57c95350---14822932908.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8cabce71---70841898279.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/xumijazewuxif.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62323b526---71428399937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+are+the+possible+questions+in+pageantPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABE 10912 bytes
SHA-256: 8df5b9aa8bb323c4a3d3dab464100abd42f9d685a564e31334d4f3059da7cbae
font_01_sfnt_off00016366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16366 19164 bytes
SHA-256: 9218d704b11ea111e728715800262f93b46dda0ea51a5524a0b2ec8854f61613
font_02_sfnt_off00019478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19478 3900 bytes
SHA-256: 06262b33c547954b6bd9aa4845edd837d8aca241f3ab6e1fb3baed6e23f244e1
font_03_sfnt_off0001a35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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