Malicious PDF — malware analysis report

Static analysis result for SHA-256 758a8a7b1fa526e5…

MALICIOUS

PDF

73.1 KB Created: 2021-06-20 22:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ac70d592d099aa622abcc182ddd6396c SHA-1: 99f88b4eb93b98fee16c0640294243a36d66da4c SHA-256: 758a8a7b1fa526e549b83375643dc40dd3a882a5c1800a320e0fe417bb1850c4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and embedded URLs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf44703b19---88052374667.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0b0f911734aa5f939a764ec9d12c17e0/22668488091.pdfIn PDF document text
    • https://yuss.it/file/79895845761.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/nscms2p43hj14fmq5ve6ggbro1/89117055209.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/dajerusigiw.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/e24rrfsj998abj9djd82d821at/pesuduzuwopanor.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/60m3jkkkt3fujk0oi8cvl6dfat/rejoradozumezilewozawataf.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/razomikafabojusese.pdfIn PDF document text
    • http://adveotec.com/img/file/56651965771.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/46185131232.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef1ae0d7c---57021985341.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b828af177958ef0c6c0b8a62a062a3ab/dapajixepafogaxorimeje.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836a13a56e---ledefoluxedeloxugumifetiv.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/20baafaece6f5818e85177acd7148a31/43688233107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=statistical+shape+analysis+with+applications+in+r+pdfPDF 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 5540 bytes
SHA-256: c22563f6784e6142aa17a13a6c6fc898b48e499b922cf792bf9489fb816d1923
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 11020 bytes
SHA-256: bee6eb581f5f0e188ba8059492215f90bae192b95520b6653d5fae98461ae8b9

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