Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e065f76cd4368f8…

MALICIOUS

PDF

96.4 KB Created: 2021-09-19 11:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1af21a20bec359523dba17ee81f12fe5 SHA-1: 2564a71e4b173c62a715d65515ab4a395f0a5031 SHA-256: 8e065f76cd4368f826a741767fc98e111c869b96efc087a24a8ac2922f55aa09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://hibertek.com/image/files/20210901_194731.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/32220332747.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130788ea9618.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/27126643696.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/90320224132.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/saxurajititerope.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0790e5a9---nekamuzetosipax.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/dudepufuletopugalirini.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fbec66121---85997558809.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/tekuwezorikam.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/terujofev.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130688ca1554---63529546538.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/11343969654.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352a6a28bfd---wovikijotijapizuxawekazep.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/nemol.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/3951361555.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/nutenoribamib.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/93919443147.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/93298873280.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d6dcc265---49814676751.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/barulebusuzisewafewene.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/mebatewefesopakabon.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/jixekemadefanewu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/wojule.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/zovusozexatiwote.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/fokasebaf.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/sekadatitupawokofejaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=avatar+full+movie+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_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 17356 bytes
SHA-256: 0327a89753727db0e8b34dbca54710996bd4e3b6e7805e0461045bafdb2fa525
font_01_sfnt_off00014359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14359 10580 bytes
SHA-256: b42d77e33fa06647c462c4c6f03f227d3d17c5f6c729902798f2faf63857cb31
font_02_sfnt_off00015b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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