Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40a709e394f2f17…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 04:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45003fa9cc8a71a01cb07443f95e26c7 SHA-1: 6d6ead5442b1adde2ed1d898c91601b2eeb131d2 SHA-256: d40a709e394f2f17c7afc60fb6421012b8b1fbc12c0d4b6c52bae2fe6db67c57
164 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to various compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studioboscono.it/userfiles/files/nagipiveboralomowanojurup.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa40d9425---zulumuv.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/dotinadawex.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/959fc0601f200b53434aa039b4d990ef/78752354360.pdfIn PDF document text
    • https://cristalensi.com/public/File/zepadukepone.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/jinedixudepagelajekavi.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/nibixivudizoputiluwon.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0ad0b3616e5489e2501c93ec184d08a2/82053398585.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/sifedoguvel.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/6376180869.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/vobez.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/degedagulisativikoz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b28c11c881---titofagisazididobasizu.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/pezizebikerutozoxijuxuk.pdfIn PDF document text
    • http://chineseclothingonline.net/File/80694230116.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c6e64b421---58666742901.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c062cd118---tibafafinusedujero.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/59738510927.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/89e8f7a0f66a624f30aefa176e0eafc1/26206366789.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nasolugiposisuj.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/66448198411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+server+how+to+add+pluginsPDF 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_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 11144 bytes
SHA-256: 5166f0c8b91ed535c711989be0b96a8123d1693ac739069604620ca131bf5a75
font_02_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 17128 bytes
SHA-256: 6b6486e896119ab76d3b86f4ba6aaf69ae8aaa197989894cab73b5c16cb1656a

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