Malicious PDF — malware analysis report

Static analysis result for SHA-256 c024317f7780a7ae…

MALICIOUS

PDF

67.4 KB Created: 2021-06-18 05:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 13a7857de23bb6094d929f59957914c8 SHA-1: 32d4a2c407c7835810d6b8b07ab852e61134ce15 SHA-256: c024317f7780a7aeef4fa5803c8629f840a4866c6242a0db46150dd6dffb5228
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress installations, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF files hosted on various domains, often within plugin upload directories, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2d33bd5d095ad074969a5f4b0e6e6e88/31815845533.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/bffe315a4f17d2363b4e819b31ed7c47/82061878563.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/re0755ki0uioimt4fqpivukog2/12121288214.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/64887814165.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8f6befa8---44693532284.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/12hof40kug2r9oq63g6nd5ogig/29944172858.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pf3smaus5hp3fdnldqks939236/xepinagunoxegixagasexelo.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/wiwinebinuserusi.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/pidodomizezisu.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/s5fctkn5bd04kegelobq962d9o/pafedivaraged.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/42a37404b5b64271b61c6111c29dd233/59312238660.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/fikugegigifivum.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/popawapezemuzatelije.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/revororaladis.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/ngfLrbzwjls/uplcv?utm_term=plant+breeding+book+by+phundan+singh+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_off0000c407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC407 5612 bytes
SHA-256: 75d06320424928b19cab7c20921d088ec7689e0c76b56b8472eb5376bf50708b
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 12900 bytes
SHA-256: 344c1b3dbb0878b313fe4d22d7eb781e1f3eab4174f767f36a41daebcf10c4c8

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