Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c53c477c7bf0032…

MALICIOUS

PDF

80.8 KB Created: 2021-10-07 02:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0882d4f8c6e7b4ac04d595f5a729df71 SHA-1: fdef11efd5b720312d889de634bf4049338d12a6 SHA-256: 2c53c477c7bf0032351b0979202c9f01c55bdaf5978298c0496f3193efd7c3fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=the+reciprocal+of+7+is+asvab PDF link annotation
    • https://cepatdaftargroup2.com/contents/files/62369166897.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/44656524909.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/87508717921.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/rebidimefumidixajar.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/zevexoforet.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/61552496854.pdfIn PDF document text
    • https://22importexport.com/eimages/file/rotepugemigunusina.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1dbd3ea5c---93911401923.pdfIn PDF document text
    • http://dd-eng.com/files/files/lawufoviruzaputekuvu.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/fijaribo.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/90570632880.pdfIn PDF document text
    • https://vgk.tw/upfile/files/2021/09/26/51939696817.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210927064422.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/42556704975.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615934e55393c---dexevatevovoxizotila.pdfIn PDF document text
    • https://jss-moms.si/upload/File/jakikenapemajorisojokop.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/gugovupulugegutodol.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/32832702198.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/76596171894.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/16234663894.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/42494118620.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d78f2db84---35738331535.pdfIn PDF document text
    • 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_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10592 bytes
SHA-256: f39db9f07e85ea8064ebcabfde3528f732a6211bcafa48c36cbc6046ba226d8b
font_02_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 19592 bytes
SHA-256: 5ca3e59339de72cbb50cbe498f0d3eab5c780b97e86153fef183e1a4331b56ce