Malicious PDF — malware analysis report

Static analysis result for SHA-256 31934e6b332b8fd6…

MALICIOUS

PDF

88.4 KB Created: 2021-09-20 19:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0703b2b297c0973300de838e77adcc3 SHA-1: 60ac11b64aa17793b223bc34f6bcd4dba6d6f802 SHA-256: 31934e6b332b8fd65c41304351a0df5d7bd6310c214ea3ca95f708bc558ccbe5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and numerous links to compromised websites, including a link farm on disposable hosting, indicates a malicious intent to redirect users to malicious content or downloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=zombie+hq+apk PDF link annotation
    • http://gamax-motor.cz/data/dokumenty/66117498030.pdfIn PDF document text
    • https://fasaac.org/temp/files/wadopur.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/63666186066.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/jazizanofonara.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/zufadojatovor.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/74868487789.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/41388051544.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/11253750971.pdfIn PDF document text
    • https://olterus.net/contents/files/xepexurade.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/49049746881.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/jiragaguliduraxemered.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/12068304081.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfd961a81---85283866679.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/43407984999.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/verixubeveri.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/91930349057.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/63954105073.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/21600713625.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143ebc99abab---wakimodofitasi.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/78359821639.pdfIn PDF document text
    • http://duef.ru/public/file/37461617317.pdfIn PDF document text
    • https://sentralperdana.com/file/pejinitukavevovakinudem.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9f60dfb0---71641803318.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_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 19976 bytes
SHA-256: 827b8f81f345f79496c79a6eeddcc8761a26a0840503a55eaaeb8be7ce3ad74a
font_01_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 10340 bytes
SHA-256: 2a96aa825dfd885754b8b10e8117e339ad88fd79e1d0c958d19b2dad3839cfa0
font_02_sfnt_off00013c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.