Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce7f412bdc548e0…

MALICIOUS

PDF

88.0 KB Created: 2021-09-08 15:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5bfec02ef649f568577215d2f258486 SHA-1: 3fc7abe0d43d6d7cc8ea5f00a2131e76589013b0 SHA-256: 8ce7f412bdc548e070bb21bf0517310a9eea63a85ef09cb9ac07856349448403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with a limited number of links per host, often associated with SEO manipulation or phishing campaigns. The presence of URLs like 'https://nomylo.ru/uplcv?utm_term=karcher+k4+ecologic+manual' suggests a lure to download manuals or other content, which is a common tactic for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=karcher+k4+ecologic+manual PDF link annotation
    • http://studioprogettoarchitettura.eu/userfiles/files/78857061743.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/zumitewabavaxurotibulev.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613216991c0df---wixivowukukozobadexasizu.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/tobanifuzafokizazinufegu.pdfIn PDF document text
    • http://citty.org/images/uploads/file/10752045828.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/vizakinutanopok.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/98758219099.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/jaduwolubidov.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210907_C302B50FF5A9DFC2.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/zawivotoluruvefosojezixu.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/67845244431.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/tubirimesebagefawanipo.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/28508152234.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/solinijulo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb18df72f---35381711282.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e319d22dd---31130789551.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/zilebuwewugovika.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/5402780342.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pajubitediginal.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/33598685816.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/sixijapodekapulu.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/degozawato.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/38913526273.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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 10672 bytes
SHA-256: 6e1b3eb84f6ee8fece72de557e88001b9c3bba3ba977ad1cd0592af44d4aaf57
font_02_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 18784 bytes
SHA-256: b94eabc519fc28c25e8b772d10b425f44aeddd8869e3fef443c0db07805282c2

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