Malicious PDF — malware analysis report

Static analysis result for SHA-256 db24a50a6d6adae8…

MALICIOUS

PDF

71.3 KB Created: 2021-10-03 10:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 07710ac317b13b676c0ce4e2390fb5df SHA-1: 70bdec9f7e84fca632d11bfb28ef1b4eeaf42651 SHA-256: db24a50a6d6adae860090f2f44c37e1bed2a0b78acd81e61ad28e3ff2d53ca60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laborke.ru/uplcv?utm_term=diffusion+low+to+high PDF link annotation
    • https://fedico.ca/upload/editor/file/wewixalipokix.pdfIn PDF document text
    • http://usagimatur.com/files/others/pemutituwojiwujusaritope.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/13690315898.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/faxarikukarinoxuti.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/xelibusipovesilozopel.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/50812875204.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/25003703296.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210908184836.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/13099015857.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/93431247653.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/71964707905.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/ramitoforuzapa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e028c9234c---31905440866.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/78891676173.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/63778673307.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/bumajosorut.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/81821803183.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/eldlbapugsq5otkjvm184kr4i5/fikoxim.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ereie9r21d724tnkci1m04rnv7/jatuxulusatabamaradibuvo.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/80203765603.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/vabawa.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/16560437555.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/xowagelijoxiwopumet.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a6924e92---27211258562.pdfIn PDF document text
    • https://maviet.vn/upload/files/40608199434.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/lonodoza.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/64749316372.pdfIn PDF document text
    • 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_off0000b683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB683 16184 bytes
SHA-256: b237bdaed2e58f2de4621746d449d91af38784439f3beb537fb4fb63b7ce0742
font_01_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 10288 bytes
SHA-256: 76c428fdd04f4884dbc5343bd81c288cb791943817267f5914d2f6326335cb8f
font_02_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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