Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e205ca61593f46…

MALICIOUS

PDF

95.2 KB Created: 2021-07-03 01:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20d34106138295faa428d6e78f5c450d SHA-1: e401fe2a1a5e1d4adea6aeceb366f92b7505e94c SHA-256: a0e205ca61593f4697ed17909c4e73c0ca0363caf1a3a5b63b91dfb820e81a42
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://wastran.ru/uplcv?utm_term=it+interview+questions+with+answers PDF link annotation
    • http://cabinet-blin.fr/ressource/site-image/files/48001117056.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gda8vdkuvp3a4be8abbb81mro6/duzodajezewepototol.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6d67ffb02c3cff464050db206bb1f822/vejomomodarekifupoz.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2bd4dec7bbf52ddab6d89f92eba2e507/24964239521.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zovederofitar.pdfIn PDF document text
    • http://prosquash.by/data/15010653578.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0106fabba778c353ec2800b8c370b02c/takuxisozubanakojolodof.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/stcjb31v8ud4vgis167ncf1ugn/1441881429.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/63782594646.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975f77f2303---nadopapowisixominoz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f6d56d9c---luxapalufarafofo.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/24379789207.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/riforoxiloni.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/kerupififa.pdfIn PDF document text
    • http://renovator.cz/files/file/wenovux.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7obgi7ldpe3r63b6vrdbonhc55/venugirusurekixisakaxuna.pdfIn PDF document text
    • https://bselink.com/userfiles/file/selemolunixata.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8f35cfdcfedea5c358404b74f6e35b3e/96644677116.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f853276f9---92991645703.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ce68c478399---84676254075.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/99da8ff6a4f92b01535e1b8cfd22c12c/30716605028.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/gewemulowuga.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2101a2562706698957a1ee2092101133/fujexodutixo.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/97706244364.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f93510e9---volitodixajesito.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec51c9b499---xuvetazesukuxej.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_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 10508 bytes
SHA-256: bb9da321f7665c60b3a9459a45c649fc9c0d6321068a4479bd268b53ea5e7fee
font_01_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 17792 bytes
SHA-256: fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b
font_02_sfnt_off0001573d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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