Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a5077babb806bc…

MALICIOUS

PDF

86.9 KB Created: 2021-10-07 10:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 80c99c45c4fd3e6cc4981f38205815fc SHA-1: ae30fd63611f04b347c955241f7c8803d232f541 SHA-256: d0a5077babb806bcead22c02cf5041e2dee550abbdd467c26fffb724673e3401
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be disposable hosting or compromised WordPress sites, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=watts+to+joules+formula PDF link annotation
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/36627266454.pdfIn PDF document text
    • http://synowka.pl/galeria/file/43003694327.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/75425267295.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/pojuk.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/3747506896.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/zugedidupijunizotuw.pdfIn PDF document text
    • http://greenglobepms.com/uploads/rijojujebovufu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/43451582414.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/64480005191.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/fc178747n74f0asdh4792ro4u3/28440556015.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/82228175938.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/tuxunajot.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/93f231a9e58366c11df4907a55e10514/45108036210.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/74201843434.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/73693220515.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/43251575001.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/o5sa2flk632mogcdke99j2s4vd/78932466471.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/30029751100.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/82103908123.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/kunulukafanizu.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/popokigidulu.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/75353597212.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rg5ja750t5490svrfree9etpqi/jujolasevozadutenav.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_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 10404 bytes
SHA-256: c813dab16327d965f781ccf53ef741dbb0d585273cdc4b0cc5d92dc48067b949
font_01_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 19812 bytes
SHA-256: c7faa282b98b43367812f9e1dfdcc8eaaca79324a50d0ee452a13e29dee302d7
font_02_sfnt_off00013625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1