Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53f2237e08648b9…

MALICIOUS

PDF

100.0 KB Created: 2021-06-19 04:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f2041f857c71d7e8e55b67bf15667a5e SHA-1: ff2ae8b838a6e623b6a61b7e501c56015a383f7a SHA-256: f53f2237e08648b9c3afa507e400bb37ec70ee97cee1936c994ca0fc7954d885
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://elitaliaweb.it/upload/file/97790382693.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e7166ad4---74633555798.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/78551543884.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/addd5d880c1b2315aef66650b84cd593/gugabaxiradadedogumi.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/tibikiwewokotamopiluxisav.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/415b0a310fe493ff5231dcf41154d957/4390293901.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/npt61n0je1g82hg4ih64lnhiu7/41244529358.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d7cdce1ef6d246e17ec03fabb2905f98/67629435119.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5hmuvhsjq9rhkme70ae157u0gh/jebujezojuxekud.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/36553194381.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zozasotixonorod.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/65191423239.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8vlrldl40hqpjfpjcdafha4css/xewifuzeku.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d074e32a7f---wutupetagenagus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cartoon+motu+patlu+download+mp4PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 5012 bytes
SHA-256: 8fea7026343ad0f15eaac19b4d598b8f8d6a99755c13728ff5fa0e8d20610d37
font_01_sfnt_off0001339d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339D 3380 bytes
SHA-256: 43e753f915a1c8b7275f54817c2bb06ceb3a60be1ee00294c37f96739b1f36de
font_02_sfnt_off000140f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F0 4264 bytes
SHA-256: e4fc079eed2ad0cbe7822b61645be9747e95fef6783bcfdc943166cb1f3302d5
font_03_sfnt_off00014e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8F 11840 bytes
SHA-256: 951fd9b87cdd94b6b40c0fd6a706b9d14cc75492baa1be8e28e8102193eb2f5e
font_04_sfnt_off00017609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17609 2856 bytes
SHA-256: bfb997d198ec41c328032ab08a389e28747b3e0e09eac5c1271cdecbf0dffd14

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