Malicious PDF — malware analysis report

Static analysis result for SHA-256 67712a7039757441…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 21:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15be1e9397cb7673e37561990b5b2f72 SHA-1: a5971d19f5300312ddc64874cab87766a0910a04 SHA-256: 67712a703975744185878f440dea8241d1a928d42db4b8f3d3321cb860aec02c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS platforms. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab523d887---foxerinuvavibejipinugoj.pdf In PDF document text
    • http://pascalparrot.com/uploads/assets/file/wirupezavofu.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910185327.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/sesasasif.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/dejatokikoxowenalano.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/girezo.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/40924335908.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138905fc8690---15007106825.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/wasapafijewogupugubexab.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/maxusobonakojufipadazi.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/zupasobekugemisuw.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/murojuguperorevolulexunu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161414694f278c---98175182240.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/vaxeferawax.pdfIn PDF document text
    • http://artepcb.com/upload/files/tikovaj.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/sererafasafuxolojeg.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb29525e1---nozujo.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/92135180456.pdfIn PDF document text
    • http://mamam.by/upload/File/file/82639921154.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/39115649579.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/3743358605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=league+of+legends+android+app+downloadPDF 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_off0000b44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44E 10716 bytes
SHA-256: c8ae9832c23ea88b6c5f4ac2f681d27c03f7e4277bde040325b8b99ab2f4ddb1
font_01_sfnt_off0000cccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 16524 bytes
SHA-256: bcf87b9460acee0d72a1f0275901f6dc53e89f0eedeab22cf222fb583a40a2f7
font_02_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1