Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7b74dc67f9e9fc…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 04:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6123750d0dc8fd1181b7f3f4c15a8940 SHA-1: 9386903fcdffe25f065bdd48ed374b2323d8676d SHA-256: 5a7b74dc67f9e9fc440928bb85141e568fb9af3152c33574478558d42bb802be
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The document's structure and URL patterns indicate a phishing lure disguised as a PDF reader download, aiming to trick users into executing further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=pdf+reader+download+windows+7 PDF link annotation
    • http://auto-rad.pl/userfiles/file/42154472179.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc48375d54---67567185790.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c10e33f187---49133291591.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5ee71a4e---3408480267.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/44458633039.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a8c80f983eddfdc1e3e0764fe47819e3/wuvata.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/lutobokujoped.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/85442919741.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/foev0vipfku2d8l2qh3jl1prg7/wilanarewodorebuwidaxuted.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5eb88b17f---14044259344.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/48662798297.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/31fea7e55420d37bbaeaedbdfd7e5a72/60972279885.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/caab337879cf24bc8ce9755cd0868096/96797282479.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/15b8bcbaab812ee1dac4c7e302c29e16/6659591410.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdeeb5b80---rapomejaw.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/65414108259.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/dhgh5o0bte1l2qtllrqs6puhs4/gekasateluwixafu.pdfIn PDF document text
    • https://jslt.site/js/ckfinder/userfiles/files/91201015371.pdfIn PDF document text
    • https://invest.pl/userfiles/file/sukogufigutok.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/51064691644.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/xojop.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/lomolotiz.pdfIn PDF document text
    • https://aedwea.com/upload/foto/95928329939.pdfIn PDF document text
    • http://livestocktool.com/d/files/85680834398.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_off0000b62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62F 10384 bytes
SHA-256: 50b9636595de7869ca2033e675eba214566985fd37faa0855e61bb316fb83635
font_01_sfnt_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 16004 bytes
SHA-256: 8a1f09e4fc73f6902bfe253c2af7b76ce1244b29337846f5cbf96c1ef2893d9c

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