Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd3c6fd642aad7e…

MALICIOUS

PDF

98.8 KB Created: 2021-09-18 05:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 619358c9d323b6e7199070eab41c5993 SHA-1: e5b77e6994b15bf1ccd3c28b5ea6d1fed6a2084d SHA-256: 7fd3c6fd642aad7eb6c0a2441c7ebb34d85cdd2060bfbdceb1c0c63c7e2edc4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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=miui+12+update+in+redmi+note+9+pro+max+in+india PDF link annotation
    • https://solener.info/ckfinder/userfiles/files/19561953501.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614506fb984ae---26596273047.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/sifujaxawulokigo.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902165003.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d8c4565a---pupelexunibo.pdfIn PDF document text
    • http://gibisch.org/files/files/29119726785.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/lumaletugef.pdfIn PDF document text
    • https://jurad.eu/files/file/52452456414.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/74842111898.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/gifoporifofanisadututij.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/ruzezawesaximanozasuf.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/suxopirawudinagojolo.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/wiraruvikawosorerupobula.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/95065282982.pdfIn PDF document text
    • http://vlajamo.cz/images/file/97292058165.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/29087851279.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cfd03c7647f7864d8e3d8eb26f341a6c/nisanikudubazos.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/xatamalarumoguzekoboreta.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/tadokezotadajulezazul.pdfIn PDF document text
    • http://serting.eu/userfiles/files/xirarojufepanusotapul.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/94910593082.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/7696603469.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_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001329b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329B 18800 bytes
SHA-256: 4f752ac13238ea30a268e5ac11e4bb0c7e21abbea306f0a1210c59196cdf9743
font_02_sfnt_off000163e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E9 10876 bytes
SHA-256: 480b3ede76f4ff7e2b9f9f1761e6325d90504f2ff14ffa8558a0f2a8201e5360