Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad4c573b1a52362…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 04:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b3ed8e64b5c3ef6f9b97ac457c1b119 SHA-1: 11f8f19c176413c0f2723c3493c8c7b97f6f551c SHA-256: dad4c573b1a5236201662e256ca587b52d7a6cebe9aeeedc382ae6365d64dbd9
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate an attempt to lead users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://indirimlipin.com/calisma2/files/uploads/sijiwodolekoretowegumosi.pdf In PDF document text
    • https://hk-delight.com/UploadFiles/file/37443524153.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/160dfb6d5c1a3b0feba2e5cfad35532d/kebiwanubakojo.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/wibebuzasarokifu.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/wigidabikupapovozos.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/28214276524.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/90096455617.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/04539214f977130f07ac5d80f7d25997/vajidixorapupev.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/66575789101.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/42636810977.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/53877508524.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/desane.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e309590350---nevumuxorixab.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///33627818819.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/18123594114.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/xodaxuniwa.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/fobamo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kamok.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/28014194882.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/tidedapazotanuxufox.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///tivulazewole.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/perigatiperimuvi.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/dimurilixobixomojike.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/tejofesetozuwez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+watch+tv+channels+on+firestickPDF 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_off0000c210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 10668 bytes
SHA-256: 7deb5571988f753065e7d5c8a34c312eb54bdf0eb77154666365fd6504a2bbe9
font_02_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 17708 bytes
SHA-256: 1d70f1720f08147027a8bcf530def9f39a8295ecfa952a39753c40c85db77cfb