Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e3af09525ad719…

MALICIOUS

PDF

86.8 KB Created: 2021-08-14 05:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b685a5477bbbfb14494d900130682921 SHA-1: ac6a5bf78eaf419b1250c1f7cf1a06b934457532 SHA-256: 48e3af09525ad719417f322e38c1357fdf54a8baa21e22b222535a560de8e3e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://krisoc.ru/uplcv?utm_term=ejercicios+verbo+to+be+presente+simple+pdf PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9s7togtf4qqa5cq1109uvr1770/9245332260.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/45617f8d35bc10fec6e9933c6a6ba97e/getudizawezagewonita.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rb0ti9f323th4lgrgeb3s54s2h/38159036135.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/30705045582.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/lededajupuf.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/93059800252.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a92cfe152a0---zejikuruvuturonigejefa.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/9kj7rbu2g4ha5u9i1fp4se2bgl/samugafesisaxinepi.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2b640bf44da860c978f8b957d1b08970/82883516736.pdfIn PDF document text
    • http://cx-gl.hu/images/files/gelafubudizemikoguxupuna.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a404fc416f4---34319139306.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/fulogixurox.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/34120881787.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b9857a96bbdd4143d20d280ee1524f4c/55357620405.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gavozutitevitetawaxivazi.pdfIn PDF document text
    • http://www.bandungmesin.com/file/kunip.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/16338955605.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/vikad.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7743c4336d---kisuvot.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/84f0d5ee3b3ab2edc188be9344cf8885/90070498544.pdfIn PDF document text
    • https://whitesal.com/data/images/file/2525_20210714003043.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 10936 bytes
SHA-256: dcf8053d2d75f5ac3b62a8643b95eb5dd77a1824a77c6597f669b7ff98e376ec
font_01_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 18780 bytes
SHA-256: 54749ad23149375548056e2885d195db5791ebb4e5b39a2d2bd8d47a0756dc1d
font_02_sfnt_off00013410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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