Malicious PDF — malware analysis report

Static analysis result for SHA-256 62651babf1264698…

MALICIOUS

PDF

92.4 KB Created: 2021-08-14 10:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3cbf79266f8b236c4ee9fd9bad93bc10 SHA-1: 29b457aa7e50c3083ab7434b575f98e59e59ae46 SHA-256: 62651babf1264698adf7047db2022ea9a96ed559ded1ab09e49f984baa11c8b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=tres+veces+t%C3%BA+pdf+gratis PDF link annotation
    • http://al-bandak.com/userfiles/file/84614571925.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/zopefasofepipaju.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/niladegopaneberetunekodi.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e01f21b5de891e712a39891ac18d2e4a/81139185349.pdfIn PDF document text
    • http://axwelindia.com/uploads/kupedasazufeguxivevi.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/nugig.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/56742527816.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/kugobiv.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/45503877105.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f126c491f3aa4e88d15daa5c84fa5ca6/xurovabenasozovuvofani.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/japaludopu.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/95e720c72a9dd0f61f0e5db7a9e25187/jegaretisejimuvebobujoti.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f448ebb19a---jeroxizifevutarino.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/liwudixomukelazetixad.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607beceb828a3---13937507316.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609899aa640e0---72484439361.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609052c9284d1---8833581101.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/776021d053a8c1b910901cdb87b3c1db/2012686255.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e95bd90f1bad45c0044b9e66a6f66f7e/katijenogamukanesoxabajor.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/85180799021.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/68274031459.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tapategetolu.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zavozapesirexejiviwisexan.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/zokumara.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 10672 bytes
SHA-256: 8019fe6f93005092257d7f007aa8b327f32ad906f5564d022f6ac58a8deba210
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 19068 bytes
SHA-256: d7c60a05ac31b5321d9a7994c671e6726277bd46972a6604911cd41c291c7e5b
font_03_sfnt_off00014a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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