Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bef8d6472d828f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 12:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7bfc8c2d15a0878412f33b8a6572876 SHA-1: ab94b1eb4928bb227dc1c1621a1eaf5f84d9be3b SHA-256: 58bef8d6472d828f219a9f6535c83db2b369be0c041926a642e8cca77aa9f32b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links suggest it is designed to lure users to external sites, potentially for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dxczx.com/ckfinder/userfiles/files/20210910_101829.pdf In PDF document text
    • https://raselapp.com/userfiles/file/pogegalotigigi.pdfIn PDF document text
    • http://zamgph.com/uploads/file/07113107393.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/14061794155.pdfIn PDF document text
    • http://dakmet.pl/upload/78999836410.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/lonatuxomobuw.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/vukabarawun.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/nolunebejubaxowofexefon.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/55343793655.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161301b8887624---41250442671.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109050227026991.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161366d960c496---fawomebagifuxete.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/todopumewoxexizizubu.pdfIn PDF document text
    • https://kultmotor.hu/images/files/57438110634.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/vibiraxexi.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/bisateropifowuvoti.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/ritage.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/rozikonoriwumumimi.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/6595612586.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/tewemefowoduzuza.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/xometizafalekobebosediviv.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff71884421---kafimapebazabuwixibifo.pdfIn PDF document text
    • http://dogable.de/userfiles/file/gisiwakus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+online+porn+gamesPDF 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_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 18624 bytes
SHA-256: 445f231a533484b9d12c133d3a7ebaeb1ab697ba11724cf6efd9f2f4d495708c
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 10616 bytes
SHA-256: 1b8498ca8d301371f174211d04e1ecd53cdf9e9a7170b7974bae457533a41658

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