Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c1f84ca7c80a54…

MALICIOUS

PDF

99.2 KB Created: 2021-07-13 19:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 85627bd762031fde01ffa8c7d01ffe51 SHA-1: 4d6cb407bcf6ae63649dadeb2121a5f4860ceffb SHA-256: 67c1f84ca7c80a541d4b52ef3efbfb6a283607d4d1bf79cadfbaf1cc31278129
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users by directing them to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://impex-italia.it/userfiles/files/ridob.pdf In PDF document text
    • http://ongnuocdenhat.com/upload/files/potomubujixiborapexole.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/g7c5hno21ia0jemlv1au74t543/79193457307.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/vimufuvudaxomekedapubew.pdfIn PDF document text
    • http://www.heksan.com.pl/file/15216889592.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce375ae24---lovawapiba.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079c056c853c---korafutexakimuvimijese.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/dutaturalukekupafutuji.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/4g32g8e703egb988lel8d4maj3/74681453632.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b5hvbdekseaekq1sc5tqmi0p35/33395452144.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/27036379bfc3c8aa641e73bd57a103db/64023691772.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215126139015.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608002682337e---lofunoxuliwazinil.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8c1cf1e76c6eb32fd71a139556fe28ae/96918300691.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/74778114118.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e5d0f029d8a7767dc629089c066585c/88474111334.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/33fa21e8720099ec3add88c51a4fa761/lesufomurodabokenepakigi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089912ca9b66---nutimefuludunolekuwuke.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/kuloxor.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609985580c41b---dasunuzakebeleper.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/97200109170.pdfIn PDF document text
    • http://kezmosas.hu/files/file/wagarapamaju.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac97837af0---bemisidode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=please+confirm+your+attendance+to+the+meetingPDF 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_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001342f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342F 18200 bytes
SHA-256: cecb8cb46c872263557b610637678ab5181776b39a3d9f9b490d0be9d6d4dedd
font_02_sfnt_off00016412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16412 11140 bytes
SHA-256: 4ea09e85bcdcbee0708066c73410b813099ba0d12212ab023f759f0360baa619

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