Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f14ebbc6bc61c1e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 10:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 585e4dfcff6d3fdce1a82df630fa65e6 SHA-1: 9245e6c15bd0f840b237973cde1eca7f1e718527 SHA-256: 7f14ebbc6bc61c1e3bdfc871f6e3f9d56a3f53524c300275f101b560bf75558a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=noritsu+3202+specification+pdf PDF link annotation
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb21236cf1---fovezasusedogipibesi.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/39629368412.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/nabekirezu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b33974388---9823757636.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/manepovinaliketegula.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/38471189918.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4f749faa70677b3f9e2913442d0723e8/80194513966.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093d52d7460b---vexapibige.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/85122812093.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/17361058960.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/vupilaxujudarobigozoz.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5a5d82a9---61949968636.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/niguzotilevobilafofum.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a6cedd6a---poreponubogev.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/55a2a2a327ba73285ac7b7a5784e4988/pefabijitofezuz.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/97345309702.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/31242245264.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/zonezuxaseruxiwojeluxa.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/danukisixeb.pdfIn PDF document text
    • http://polipack.ru/content/file/91457783146.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/nevireserewumugojoxekixuv.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/fupew.pdfIn PDF document text
    • https://wrd13.com/force/file/13858917572.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/55238060539.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/rorinibixujo.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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 11056 bytes
SHA-256: b0f3d24b0ac6aaef4b7115035d7032c946b25547ac2c3490089689ee2d6d8516
font_01_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 17488 bytes
SHA-256: 16aa0b7870eb20c9b2ba08256d0c1957f4e8e7deaf209124b9a199b0cd5f4cf1
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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