Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1c14658d3e4c11…

MALICIOUS

PDF

62.3 KB Created: 2021-09-10 12:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 753ecba9337273f85c4e04803b2ba88d SHA-1: e382f94d60848ec70c7ca246a2456c5759c98dcc SHA-256: 6c1c14658d3e4c1120741ae79ecaded8d328e1a40f94db8ba20d291e562d8d2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users through a chain of links, potentially leading to credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7898

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=brothersoft+for+android PDF link annotation
    • https://homestayhoian.thamtuddt.com/uploads/image/files/tapunuwobuzebepuzet.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/tebifo.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/74068978317.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210903_7F90BED1B8DC859B.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210906152000.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/87830134727.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/71542600078.pdfIn PDF document text
    • http://elma1.ru/!upload/files/58873678557.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/77176233487.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/31814228907.pdfIn PDF document text
    • https://anfauglir.com/images/file/32877532051.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/32617022565.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133b090730c0---74156295473.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/71173669752.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f4ea33fd---netupekibelovukarovu.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/90138691796.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad2e069b7---jikexabikitigave.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/61411781850.pdfIn PDF document text
    • http://strandedtattoo.info/file/64009092931.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/punukutapawawiwudiku.pdfIn PDF document text
    • http://venkateshservices.com/uploads/wutubeligudaxugototibex.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/54016832670.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE99 17024 bytes
SHA-256: 7d3a48e8c414eaee247f3106a4df014503cbe42f546931f4eff0dfb08b170784

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