Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d3d06c1ba2ecac…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 03:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76dc6fde1791da593bdb36008936ff95 SHA-1: e9873c812c2e4fe0052118eb6c461396401b352f SHA-256: d8d3d06c1ba2ecace41a46da2472ff83d06300fcfc12362ec558489bde6854b1
164 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous links to external PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent. The document likely attempts to trick the user into downloading a malicious payload disguised as an invoice or payment confirmation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://amuseonline.com/absite/userfiles/file/1465140658.pdf In PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9416cfe5d---83208577979.pdfIn PDF document text
    • http://maxbrio.kr/files/files/43460298273.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/japedunonudo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5hddfvdu49m9lf643q9gm5kkmi/76510757375.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8042ce1f6a---69367190140.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611ebd73ac824---31119003947.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee68fb84486---18127522999.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aef264e25e---55502469656.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/2241011747.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/wujagifagopijorevivoxina.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b48b0d13---85670478535.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/21854800304.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/pamazol.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/3514809634.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc9df9e710---17627804507.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/47005376318.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/9720464944.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/cc45c5a925a8194eb0129c98a4867159/pijexavizolapipajerinod.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/dc2b2a783c48c8e9576ca70ec1ef0b15/luxovuzukiruxiw.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/54358553089.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0ce72f556a707a46760f2e4e8caac891/46429181363.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/80986065141.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3c068d70---17105525579.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/vaxabidufawilikelijojuzu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/33f0a15d405601a8ff6b4ef3c058b072/dulezawalikameku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=valuation+of+insurance+companies+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 10852 bytes
SHA-256: a2d6127ae35d0e3454b8362e6e371eaba248154167dd836347eb56f53adfa609
font_01_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 17764 bytes
SHA-256: 4a8a9b1beff8e0502577c8b50c8f0c5b78c0e994c69f90bca34f010f85ced6fc
font_02_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1