Malicious PDF — malware analysis report

Static analysis result for SHA-256 99efada6dad7f37d…

MALICIOUS

PDF

132.8 KB Created: 2021-06-21 10:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e801dc1101d6b640e527bb58bf9ea788 SHA-1: c35df79941ab53014a124c26a9d0092443105a39 SHA-256: 99efada6dad7f37d2ac1a0e9fa96fd59a0f61bfa4a6e78553de443be93b580a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608046df5a805---96566508973.pdf In PDF document text
    • http://topupdana.com/contents//files/jafafebuzapotovonaf.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/31397247201.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a60d952b9---fuxabatemakizorebopun.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f89cbf7e---zufefelakorumavi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984123e84f9---juxabuvijabesofabenodima.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088d8c960a8e---reronojonate.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/22133251865.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/29761489147.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/vogokixixupejojije.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/zinikakonudenaziju.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da40500b30---62955903332.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/01ecc3226c67805a5536ad4492c978a4/41506108373.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/626a0b0132b1dadbeb97c02dfa92614e/21596921092.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dddd0c550---78577895487.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/bemavogigozujamibo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88092cc71---68613239364.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d2479b26---29676713093.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/PmAiG5ZyT-k/uplcv?utm_term=read+fruits+basket+manga+freePDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000179cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CC 19128 bytes
SHA-256: 005a6bd52682f49691e07282cfe3270c4e38bcd15c46d4e610451a7fff1775b9
font_01_sfnt_off0001b761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B761 5404 bytes
SHA-256: 88861d198ffcc5222080dc36fd57b927b48d20aa32e281a6111aefad36aa1da5
font_02_sfnt_off0001c9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9BB 10788 bytes
SHA-256: e604a71461a7642ac5d731cee08500501aac7d7bd909d385a90765aea260e05c
font_03_sfnt_off0001ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE6F 16492 bytes
SHA-256: b6ec0e704f1d2e079b6c61944423912182a6f0d7e19a2a96013c0da62cd7e146

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