Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74ebebdfd21f0e2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 15:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef26b20b1fdacd4adee6b5c9b23d561f SHA-1: 8608d5afc532fe1d33b909a641da8c79cb2f6070 SHA-256: a74ebebdfd21f0e2e803af99afe557d1574b24da868d5d70b66391794a3557eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb748d2a1c---30999931230.pdf In PDF document text
    • http://ilksolar.com/Images/Media/files/83047706253.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb3d3e3bf---79883104010.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/48758305828.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/jakun.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/voragefupudofaxapaju.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/66795138815.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/mopevosoda.pdfIn PDF document text
    • http://benly-carson.com/product/files/wakunusovasoduwosijiko.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/jupawejenezibarasegosifew.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/xukitodigibojon.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144cb5260dff---83075692972.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/gapojigexidaxinevenoke.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/pajifaxazixuz.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/56917440473.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/34071613319.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/fupigepovomomanuzasaja.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/kalikek.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd2b2774d---gozeberowowekevun.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/kokodanufunamu.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/19961229062.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/11927952807.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8dce5eefd---mamuzajamepizep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+remove+your+contacts+on+telegramPDF link annotation
    • 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_off0000b41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 18624 bytes
SHA-256: 0379b9bb7016c8ca76fafbf4467c449568af65da7d344d3eb3f9a37ab61a2a75
font_02_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 10840 bytes
SHA-256: 3a81313fe6edf173537664686d23244423fba14d61b4e92b2fa09532a6c15e99