Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2e9bc4d312e5a6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 02:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed52cfbc515f638673b49fd8ca289782 SHA-1: 729ab1db6870655996d7c5f591fb6f0a8006d835 SHA-256: dc2e9bc4d312e5a66c2e8c069f27e599f03100c383f39a46e222206b4b8bf2aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=it+chapter+2+watch+online+free PDF link annotation
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/zedalatat.pdfIn PDF document text
    • http://lizhechem.com/upload/files/puroz.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/89683582141.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/49965011097.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161374324133b8---87714338927.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/tuzunakexolezaritizo.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/gezavijadovinudakajexedu.pdfIn PDF document text
    • http://mutitar.com/user_img/files/bomesadefetunuj.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/89424539719.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/xefupuwexafekomojubapu.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/sobefajexejogutisuzak.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161370cc316a64---zanawinofumatuguz.pdfIn PDF document text
    • https://atrax.hr/files/7997622703.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/23696201799.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/jilufe.pdfIn PDF document text
    • https://airbays.com/userfiles/file/30796304459.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/nobowafono.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/85164197792.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/16582539250.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/6606248858.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/43487713838.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/otfdb6k6923ch788idnr4vidd1/kelobuwolegokidobexuxegiw.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/donabivusu.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/33404132461.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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 10564 bytes
SHA-256: be83735daf67ff22743444dda8c064bea5cbcd059ea687f0095319067de93710
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 17972 bytes
SHA-256: abbffbfb303259b44a82044a37a835c13a413d4178ea5251dc87c8e021ac29ef
font_02_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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