Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f6bf66a4ba839c…

MALICIOUS

PDF

98.4 KB Created: 2021-07-01 21:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 99e8646c433b13ece001950e6d22fa98 SHA-1: 7ddd12ee431b4c0f723fb456444565953073b946 SHA-256: 15f6bf66a4ba839c9e74090ee9b090ab5fd4e996b080345883540ff22e672cd6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and a high number of links suggests a coordinated effort to obscure the true destination or to maximize reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0dfbe83ed---36009436462.pdf In PDF document text
    • http://birkhoffhi.com/userfiles/files/58661803198.pdfIn PDF document text
    • http://slsnn.ru/content/file/9654881243.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa67611ec1---72091748751.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/zexetazegobabodow.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/39801758294.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69ce46da7---binolesorixosasizozibe.pdfIn PDF document text
    • http://strandedtattoo.net/file/7946871245.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/fawomid.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/dejadezixame.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08bbc7ac7---60539055122.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/12749577873.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67228ac1a---50458669885.pdfIn PDF document text
    • https://ancoraeducacion.com/images/87934425082.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2332ab45---wotumugugejuf.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d262628d94---susiboriwi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d84ec2e9e---batupalolepilexugu.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/44884805675.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072168cbd21a---nutedunuferitatekal.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a382ddfaa536ae467861df81bca7867f/31167481885.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0feb1a1ed---falopuxiroral.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=measuring+the+world+book+pdf+free+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_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13229 18004 bytes
SHA-256: 13939c2a9f5872b4abf63ee0d1753e6c527cd9b4ad8cbe9f5664b74173c46b5d
font_02_sfnt_off000160db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DB 11188 bytes
SHA-256: 8f837464647958f2e710e121e81fd157078e57ede15638c35ff9c0fc6a847e4b

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