Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6efa8ded666f44f…

MALICIOUS

PDF

68.3 KB Created: 2021-05-26 07:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8aa3e114390c7f3fdd06f8fba5c1edb9 SHA-1: 2362f348daca530261a19d269c2f963cda597d57 SHA-256: b6efa8ded666f44f7a37a70e6ed825b5c1ef072069cf85946b189818b9d1e970
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites hosting other PDF files. These linked PDFs are likely part of a phishing or malware distribution chain, aiming to lure victims to malicious content.

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 http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a96af35bcf5---78810305161.pdf In PDF document text
    • https://majorsagilekvaros.hu/uploads/file/pinopumilusibidalun.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b985a46a2b0e38ae2660caaf2cbe72b5/54538025400.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/25d5987d23e838060c7e79390a273d74/485287403.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/95440842704.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bd00277a4777bf3654022cefaef79981/dejefakibikexezaf.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4bc9382d1---loxemilededakixagu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1ecb46334c95d7f04ee75e2c77df0b75/37905836715.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e5a1a9d267815686c427970ddbdfb9bd/lusalofoneno.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3f8e13808e4008bd5129f25c2365d4c3/50956713737.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a998a869fde---jurireg.pdfIn PDF document text
    • http://kasargod.net/uploads/file/wazerexezojulo.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/bad228378456b9996d9f43cddf95a12a/wuwuvetutajiri.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/60935708160.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/norugapevonek.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/17796769150.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d38763129d---mifilekezekilixobosazumo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/569e613c544b58c76dc8d4e84230fd06/zugugudezitalodizoti.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/033c9291c83159c4993368cde3618365/gobuvav.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/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+i+watch+netflix+on+android+autoPDF 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_off0000cff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 4996 bytes
SHA-256: 05b73a71d6f0eeef634f35a7c2b839be27f9535e84fb87a959814f50ff12ab1c
font_01_sfnt_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 10296 bytes
SHA-256: 378c917aed806f04191d98c1abf4f57750b74b1567c559892b41c5e4c8486161

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