Malicious PDF — malware analysis report

Static analysis result for SHA-256 734142f0c70a8de8…

MALICIOUS

PDF

69.1 KB Created: 2021-09-16 14:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b04d442fbad82ae91229f28c1ae0690 SHA-1: 8f50d626cba480d02f61c47281a6251c95688fba SHA-256: 734142f0c70a8de8da6ae86dfb3342089898d9824732a2eae33e8cadc052c942
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=need+for+speed+2015+download+android PDF link annotation
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210912234410.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/zemojesiwiwu.pdfIn PDF document text
    • http://stroi-sistema.ru/img/53457728860.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/6226885102.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/rurobiretixij.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/44038336665.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f2076ccdd2a3aec9ef74701d5f549bd1/49557968378.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/84405997545.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/nikoralimas.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109120325101339.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/niragafasu.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/67353738246.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/59521265083.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/kujovivoxezive.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/80288188066.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/91200113378.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/gadowatagej.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efddf610d5---zorosoduramamuxobijiwuna.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fogofaxiz.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/womujasevo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365ea8768db---befoxurajoladuvego.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/fewoxipikuwiwofakav.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/kiluvere.pdfIn PDF document text
    • http://kite-surf.sk/files/50667620999.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/37678456282.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/79047022067.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_off0000b12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12F 10884 bytes
SHA-256: b29b7433629ee1ac3351a4806c65c87fe4af8515b308513f50caf0811e603784
font_01_sfnt_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 14372 bytes
SHA-256: 83a772547cc45c04371031afe26f13a42a97f5e810ea79d43034cbacb69e450d
font_02_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1