Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da71cce12f75373…

MALICIOUS

PDF

71.5 KB Created: 2021-09-09 08:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0128fca720a7a399b01162937243b936 SHA-1: 6c6b26179f708af2bafc3ba6e0ecf2fecc6a09b6 SHA-256: 5da71cce12f75373c6d43571168d46aea1fe1184f6a63ae5e0ccbd0426b73baf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://jindi2010.com/uploadfile/files/58105821245.pdf In PDF document text
    • https://ontogepszerviz.hu/editor_up/letisiwunujutugakuder.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/90418855115.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/rulubezerokerinoledujaw.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/fuzifivawuzav.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/41698140518.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133f87b58105---nikirixavezewovurezizike.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/kukutejolameja.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/38704468981.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/56531024740.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/41424641293.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/dobifasotuwejisisivopusuj.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6dffecd038e8545db6a89a7a6e237a2a/25758690831.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/7266018846.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/gomitevuwomejuxilafot.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210902040903.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/mefevufisadimimaz.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/faee4688fb24e5e0d942e1d28f1926f9/lofabofebegorazasil.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/mejerowaxopadizanukupib.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/vepenadanunuvagolawixen.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/64959900854.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/65791412410.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/benitiwatuxujixuwo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nojrg08u27gd1svqub9cr885o3/9051544611.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d8dbdafa5bb211d80dc1cc709fab126a/25944894650.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/fakugaxoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=top+10+social+issues+in+the+worldPDF 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_off0000b8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F2 10936 bytes
SHA-256: e3ba2b5cadb69244af645a50b1e37fef38260eb80b31e4eef7a5c67115808aa6
font_01_sfnt_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 14936 bytes
SHA-256: 990af85be2e3d4cbf0bc63b380cd17b97516ee81daae88924121d12f32577dfe