Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b17b03fc1ea4278…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 15:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b55cec7a048ad5f95402de9174dbd0f SHA-1: 924b5511503cb374ecd0da4fc5720890d281fafe SHA-256: 3b17b03fc1ea42784c0d90cdc1b7a10c740a0746d64384ab04626cb75f81688e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external websites, including compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

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 http://arkystudio.eu/userfiles/files/47851921527.pdf In PDF document text
    • https://heuresromantiques.com/upload/files/pamanigiditikedun.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/58289022794.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/57302586523.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/77869493482.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161381734cc128---55481584369.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/zuzilunilarev.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/74319101683.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/najejinedosof.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d860f521a99cce3860323c7139125f9b/90914770727.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/61419703122.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/72383642601.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/tirez.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/mabuz.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/musutuwosizim.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/kizobadefut.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06924c249---tunogegolewekinozila.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090101015873499.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/46802185636.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/35122373946.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/xibupanemezinuxagiwol.pdfIn PDF document text
    • http://htcable.cn/d/files/99768380143.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/39343405649.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/89912462839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tango+5.0+apk+downloadPDF 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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 18092 bytes
SHA-256: 4e268504f1bd9a9b1b1bffb6f9bd7e98571c9f742f8934e75cff61394c3f8142
font_01_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 10440 bytes
SHA-256: 8598661bf238cbf90e9dd6f14699d49210a7d23a74db3db060e506661eb6257d
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1