Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdfd8c80b330cbb…

MALICIOUS

PDF

94.8 KB Created: 2021-07-08 07:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e2da5d28bd85966db5dab9a1d49d6fa6 SHA-1: a6fd6cb2054b6bda96bdf0b1f67c484af1ea5a99 SHA-256: 8cdfd8c80b330cbb76a55b2cb70826162b3c54bdb9647c8f468803c829edf5f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised websites, likely to facilitate the download of further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a2d3064d---94247504207.pdf In PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/26753225711.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c9985250f---62738980993.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/zitezofaloxupajebinuju.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/dee6dc1234fff9ad838d7f35e83e0c27/dilifatenamitab.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dd6b9ccc0---40799953889.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0634a4f3a292c942435d6b972b019666/jiwin.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7a44676c85480ac312e14d0e4c82504b/nekuvoxebixepe.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/87b81e66a0da9956fbe8d002ed55dcc9/kigivazatubij.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44682c413---53418453292.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zemubu.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/48813136850.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1ec469ba59fc7e9b7ae31f591a16cd00/wifaw.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d26a506c0e83ea4a7ad828b602aae8a0/39562848354.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/95701041331.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab71df52b10---39208122899.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8500a432fb---11084310275.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/iu2f9s6igc482mhdfbaebfp9v3/gozel.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608120c52a003---xikita.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ff180a6f---nosisinelekuloma.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/01c37e6fc4ab013b013abdb65c857a07/nuginidutiferozegerep.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9f35fa633843180427ca156ccebcace8/fibikido.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080c271bee35---74712395558.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fa783ad25---99023483043.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977fce8b495---pevuselufelazamiwonejuwuz.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/6f4b8ba9dc0ab904771f57fbd8983ddf/67985850425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=snap+previous+papers+with+solutions+pdfPDF 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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 18204 bytes
SHA-256: b8333e3c2cf65902bb2582c82b761feb440c253626f1346f6e78317b728656cf
font_02_sfnt_off00013bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF9 10920 bytes
SHA-256: 715eedd8da49c9ff26ed2d8fe06f7b84931e0858d7033f284bffd95f8707f978
font_03_sfnt_off0001553a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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