Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd9f8b3cd4a5a46…

MALICIOUS

PDF

90.3 KB Created: 2021-09-13 14:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bd84958e94c8764da9b57b96ba53d6b SHA-1: 52050aed32dab38cfe7af5674a20366ec0d61d5c SHA-256: 3cd9f8b3cd4a5a46615e16e7835eef7677f8945d1f49b6367b092d64b53df46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://romanasulcikova.cz/userfiles/wusexuxoxakitonamoragapu.pdf In PDF document text
    • http://9y.bfage.com/upload/files/20210904201649.pdfIn PDF document text
    • https://uudanbury.life/files/file/rurixirowozawufuxe.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/wimotixizinufefuz.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f6248d7883125a22fdfe38015398c4b4/48432881508.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613135656c5ff---18250102165.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/kajimase.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/15958899494.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/zepovo.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090414530273499.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/putejurogikaziz.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74898746955.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/naboborulividitoxuz.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109091156079541.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fekude.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/14940820493.pdfIn PDF document text
    • http://myslizdrave.com/soubory/ridot.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/48410462125.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/diretunugip.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/davolezerupu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/4327660757.pdfIn PDF document text
    • http://adice-area.com/pictures/files/geninotanoteviwimegumop.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/34763118668.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/19176288529.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/43e3f84f93e3c6a56b1647c89e596d9e/87789097443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=oreo+tv+iosPDF 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_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 9880 bytes
SHA-256: c52b83cd2a68bd3815486c66ea1b3f24be8161192248f366abf4b603af03f13a
font_01_sfnt_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 19212 bytes
SHA-256: 77f5eeb8d8cb4d7dbc2100fcc8ae7473edaa99cd387467d41e789cb855e34b54
font_02_sfnt_off00014389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1