Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe7576c3094c505…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 02:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa40d87a6c86cf6e5fdf2139d2d9e9bb SHA-1: c5fd852169c41cec83646bc34c2e6c70207af2d1 SHA-256: ebe7576c3094c50523a3480d2c73a29503ab1455ea0113e7745bcd38ccefae29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The PDF also functions as a link farm, directing users to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=wps+format+pdf PDF link annotation
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f4962b97---bajosobu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f212fafb3ace1f995ad6ab6b494fa549/30188129656.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d703914f8df9baa191d5de566af08db3/vuwug.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/22488307325.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/f43ca25312bed8442ff81b84ab9c0885/rojaxazavi.pdfIn PDF document text
    • http://julianina.dk/upload/file/sozamiposezexoraxa.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/22140708105.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/12/file/20210512_034815_188.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/fapowewaxipiko.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/bozetivoguva.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d3050b3fc165d6e292373c351a55a555/33743423161.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074332b8f711---wusixemujirupixanojoke.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/3698506206091df897a147.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/zesugepenarewilu.pdfIn PDF document text
    • https://anaksemut.com/contents//files/fapiboxuburugifexesewi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/99727527855.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611662ea4bdad---dotetufufezidu.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/losopuxab.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/21424584432.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae891a5eb0---pisev.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c9a8b7dd---69920966669.pdfIn PDF document text
    • https://eternalbliss.net/file/88745421437.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/buxinawejugokiroxaxasomet.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/84030106391.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_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 17112 bytes
SHA-256: 84e95a5f7a0f3bcd65b6ee67d91bd134950df5732581a1873f97b5f48033e1ce
font_01_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 10280 bytes
SHA-256: 0b273a3c8a05d4a3dccadecd185a072c9177baa9ba126352b097128f4ed4ee0e

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