Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0159e43b166855…

MALICIOUS

PDF

92.5 KB Created: 2021-09-03 02:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da3c1c054b02f9746e0dd9a69e5e81d7 SHA-1: 31a9feec35bd008ee6befdc589432f961034d4f9 SHA-256: db0159e43b16685529a744b19ca3d57a4f9a98d072100b73068373325b11a88c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of JavaScript indicates a potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/omup1ba18fb25v1151khqui89e/32018552764.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608567dc3025a---69724661805.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/25029458095.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd21c44234---nusutes.pdfIn PDF document text
    • https://dacola.com/upload/files/47989863883.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/wukodudajizomagigomax.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9dfd56d43d2bd77deef51ecb5f93182c/6866418177.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/56958155712.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/nabegoliso.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/tibojumekalegalivawo.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/96898701571.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/zejoguwupowudod.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42981776885.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903737bd404---pokemiwikizorow.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/wozedixakivuputojavomu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcf196cd4---jelenuxerojasixed.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834199b4b4b---zupapojufufadoragimofan.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/nugavuwetumizigapugi.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/rudowopajev.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xopivobujomotobutoj.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/lfsnpubnv605v9ero11m2atoi7/tituwunilopiwatag.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/eb56d0b524e1fe108eaa8ee82bc9892b/fevimijagulazija.pdfIn PDF document text
    • https://mbbs.hr/files/vusigoxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=vade+mecum+policial+2019+pdf+downloadPDF 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_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 19848 bytes
SHA-256: 5cbb0d128be8150ec5de78f7cd2e8e5514433cf6e7033f4d4e1bf0361a8105a0
font_01_sfnt_off00013274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8B 11032 bytes
SHA-256: 91a985b78dc132eeddc66cc4ca3fc3075c15aefd4f206951d4817ee3ffd6a172

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