Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38af6c8f583fcf8…

MALICIOUS

PDF

100.7 KB Created: 2021-09-07 07:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8605f8aa8f8e7efd154e9529db4c717 SHA-1: 6ba7f528cbe1f57ce877b63d5fa9beb4ec7e0901 SHA-256: c38af6c8f583fcf8bf0ba53d750e5dfd73508decbc1684206e41bc1647e597dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c1813285---89827451591.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c181e3763b---nivub.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c567cc2b84c---maniverazupanujen.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/38557220108.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/tolenodalom.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ctofg7ch4nnm4m8opk1bkeltu6/28508191099.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/tudebotadabaropeko.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/51577234520.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084064b3ffec---11897732562.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021072516123370554.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/wafuvefuk.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03bf49c086---64994195751.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/79929435399.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kixeje.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d08f105e2---levilawi.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/zavasavifigujozigivilesum.pdfIn PDF document text
    • http://m2m2design.com/userfiles/gumulejimavefafekowo.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/33248049976.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/u75bmlqj35sovbis1podivfu63/8606039779.pdfIn PDF document text
    • http://emachn.com//data/attachment/file/80037876600.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/60011203673.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/87478850561.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafea5830ef---rilemuriditofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=construction+productivity+measurement+and+improvement+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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 19080 bytes
SHA-256: db5eb093f4f7b93ff01d48cbf0b06e8b45714e2b07165e8f981624e46b529783
font_02_sfnt_off00016ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC0 11044 bytes
SHA-256: 3f8ebc4cf23ef4a294e31ce61552fa307fa9850606b62e7492c56ce80d065705

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