Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c55f5a8537cf3c…

MALICIOUS

PDF

91.6 KB Created: 2021-09-18 13:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01880195a0d0493cad0f64a3cc08f9c7 SHA-1: c48f3e51cc4a80451932339deed22f0d35f60300 SHA-256: a4c55f5a8537cf3c56e918ba28262987c5e60b5edd64389956f7fc67ccf751a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ikomsolutions.com/admin/userfiles/file/1992480517.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bfbc977e0---bezuvetaxexopoza.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/lumivofuvaze.pdfIn PDF document text
    • http://jfe.hk/userfiles/66786104157.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/29bdd57db4b398aba0e7b45160ad0017/22924490862.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/mefogosaxegu.pdfIn PDF document text
    • http://nature-revive.org/files/file/17384004240.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lufodolezepewelupek.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141df630ce43---94136223530.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161441deca865c---50975088940.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/46361911997.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///1192751032.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef20a7fc2---falazuwefazataf.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/75544008476.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/xegume.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/vilulexabunetejoxim.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a912117d4---10809370503.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16141f8da6d408---94596678592.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/panawemonirepa.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/38311bcadcb0660a411f1eedd2ef7191/nulepajason.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/63493923423.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/35766917679.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/51531938706.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/vejenetigi.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/difikovadepewipaxijelunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ca+certificate+android+network+may+be+monitoredPDF 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_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 10888 bytes
SHA-256: 91b508c8cba3f53104bb07a28804e02b1eaee18a19b86c6ab3e6bec6bd57dc1f
font_02_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 17776 bytes
SHA-256: 6857a94bf4abe5834e0368a8564adc7a5ed82d3da194edea6554287dc6166dd7

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