Malicious PDF — malware analysis report

Static analysis result for SHA-256 203460a61463f9f2…

MALICIOUS

PDF

93.5 KB Created: 2021-09-09 15:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6a94cca39bba1b87327b874ce6e1d110 SHA-1: 801f1a743719ed85670574afbaee48b078dbb610 SHA-256: 203460a61463f9f2e301359e31ce9007250a69d01d32ece53648802f7134d869
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://estatepie.com/files/userfiles/file/zetejukibofenukejivadumo.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130077626bd5---10767009741.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/mojuvumifanopejikabozod.pdfIn PDF document text
    • https://brs.jo/userfiles/files/mowedagajavidigusexag.pdfIn PDF document text
    • http://annabarons.lv/files/files/81277148646.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/68471968241.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613441fb6341e---17109578357.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/9201853897.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/23215300855.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/12180643487.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/66867398249.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/91654123032.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/48080034673.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/lasodoridazinakemobupod.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/lidekowinokejanalejitu.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/dalimorefeparigotuvofixug.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/zuputunagukazexamilu.pdfIn PDF document text
    • http://ihdbd.org/upload/files/12567632675.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/jibowafazutajapujapajopi.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/tidajexapesakuboma.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/sipera.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/smlt6bfh7it9ked3hsadog1pvc/dekefabuguzerisen.pdfIn PDF document text
    • http://industra.sk/userfiles/file/1871205245.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/50862557035.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/20258243092.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/56102451536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sd+card+data+recovery+apkPDF 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_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 19480 bytes
SHA-256: 92d08e6210e6ab10a1d95910f41a5932191a1a9f14db3a8042e58b787e8c8229
font_01_sfnt_off0001384b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15062 10444 bytes
SHA-256: 87fe1b47210c041f6346c79ab2a5475811560a7c7f2964a59bd1862de1e1ee31

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