Malicious PDF — malware analysis report

Static analysis result for SHA-256 0782cb42ca441a9e…

MALICIOUS

PDF

87.6 KB Created: 2021-09-18 00:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab7ccabe6e44095ec605a5b33a4848d1 SHA-1: b1f3b406e8cb808c075a67fa84b1bc25855ffe45 SHA-256: 0782cb42ca441a9e1b17c18c264f78195d34a0dc4cc54c3ce1575b4f6d4d4b26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mallenmediations.com/mallenmediations/images/userfiles/file/puparusidapisudibasotuga.pdf In PDF document text
    • https://casabresciani.it/uploads/file/50008916250.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450864b32c6---40955994562.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/95173936820.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/xajujarasotedodeluxegoj.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e46980a4e---gupikepaze.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/redibun.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/39801347250.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/41443326469.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109101149215136.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/tuwevuxiwovujogile.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/kizeka.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/budijovagig.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/tuxurepomosezugibisudu.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/josogojodixosit.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/90487528951.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5777ed4a899060e902212a262ea3e7f2/78055237483.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446b359de16---dezesim.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/33044807616.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/46006672518.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/wiroguwe.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/tomuremad.pdfIn PDF document text
    • https://umartravel.com/files/45713743361.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/75057671322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tv+guide+for+firestick+2020PDF 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_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 19168 bytes
SHA-256: 274edf79e787fd22ce4ccb6bbc4fd2e6c7baa9f77e8dfc3b3f3442fa074b0ab9
font_01_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 10804 bytes
SHA-256: 5389aa5b81dc3e096d49027a3f2c5f1d12b171095e77a2f70cdd7b3abeca8853
font_02_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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