Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9371703c49f5915…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 20:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 615e1e36274ed165cadc7a1ab49e875b SHA-1: 24ad2293c234e6bc709021479a53cc6df316a4c9 SHA-256: c9371703c49f5915c18dd02bf3375c17a6e883ba863c61ad541b2d14c19e1a39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. This behavior is characteristic of a link farm designed to distribute malicious content or phish for user credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bernardthevenet.fr/ckfinder/userfiles/files/84941706686.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5aceab8bf---kuberezazoju.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/gobirupanale.pdfIn PDF document text
    • http://surausa.com/uploads/files/voxapimivulixebuf.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/42065358790.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff060026d2---rejobixubifa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da535a7bdd---nuguxovisadaji.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/katuzul.pdfIn PDF document text
    • http://flomojapan.com/upload/files/vimozejakagaf.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202196945279136.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/wibifusirenuni.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/98544633109.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/17153689096.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/9129646484.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/8490518130.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/67336763068.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/96816863678.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/notopaluwomulogu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140110c24c79---segavezibulukafukigimomid.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210901_D4ABA3C2ED6011FC.pdfIn PDF document text
    • http://gtijsr.com/userfiles/file/detutetulilejawuponopa.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/xopoteraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=restore+user+data+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB674 10340 bytes
SHA-256: d9524d7038afce51d475cae0d0334ad554d66460da2703946304479f4c00b555
font_01_sfnt_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 16636 bytes
SHA-256: 6252965688c4fe49a558bef17e8d63a76dd22ac83a0626f2662339967a781649
font_02_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 21980 bytes
SHA-256: f0449bb285377b2bbcf72383b8d79e271fc90a2389da6fdcf6a6b850b16129da
font_03_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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