Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06c89276306fc27…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 20:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cd14d0bde387b12086c687acda5748af SHA-1: 70e7c7da7361ae732f3cf88aceee204b5e21d7e0 SHA-256: c06c89276306fc27ca3b6b3e4bb40bb9dd5df3b1df20b9a6cae3f0fd076eb5b3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm structure strongly suggests an attempt to lure users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://duproject.com/uploadEditor/files/90387022230.pdf In PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6138eb730a942.pdfIn PDF document text
    • http://rideco.hu/upload/file/61632426588.pdfIn PDF document text
    • https://ksboutlet.com/file/files/legosa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/150801dcce2cb098797d184b463760ed/fedisafuweliniverami.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/68308430314.pdfIn PDF document text
    • http://salt17.com/userfiles/files/23611716588.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/10363804943.pdfIn PDF document text
    • http://mobil-tech.com/files/29455774104.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/rajafosiwuxin.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/donedo.pdfIn PDF document text
    • https://elemonbg.com/Files/File/joreguwedobugorimupa.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/9614970146.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613012926a895---44627426393.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/karakexuxonagizuseku.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/pazikezizogederetunava.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/panajenugujosine.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133640a30efb---pilafe.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161334edb4a1b2---20154870541.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/dekevizuremopa.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/66802216044.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b543da8f1---tajuzemiretiwolow.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613295878439a---59447310202.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/ragivamutuwi.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/15560979587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wrong+turn+4+part+full+moviePDF 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_off0000c46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 10772 bytes
SHA-256: 22d1851796f93de6cddbb65353509afb7d272e10cd97f854210ce5ce23b7b7f8
font_01_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 16952 bytes
SHA-256: 7e100829c8e3b5826b4bec3c8494eb8f3350545ba5a1a78c5e2c34dba498df66

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