Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa146f409f2bdd0…

MALICIOUS

PDF

71.8 KB Created: 2021-09-30 16:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d33d0561428f02178e248e54de404426 SHA-1: d8abb06504a5c3bbce54b84185f7e409241ce5b6 SHA-256: aaa146f409f2bdd08cdddae9052da97b0e45a52524331ef76c53142d72900224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://naturallabs.de/userfiles/file/64812671085.pdf In PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/35063912773.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/jujomipifazegane.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6095e8fc9433789824b4a025410e4773/senadumasedopoxabej.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/vogasinoxonisisi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ee9a28f2---76139586499.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/sobewosupewurizatitukis.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/mawimupewejanesumid.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc072c42b---tarelubasupesomulas.pdfIn PDF document text
    • http://pinxedien.net/upload/files/75122839333.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/62476156903.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/kuvebiwoja.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/zuralinexuviferu.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/22518534273.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/45232648218.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/58248141827.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ctgpcqao6pqrk2nd3g3hjoi4d4/jevikozadumilenitidu.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/malunupojivigupudufom.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/wekubiwalifi.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/19816386184.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/84480181490.pdfIn PDF document text
    • https://fq.ua/images/file/nakodemupomitub.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/62195776621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+pes+2020+ppsspp+iso+filePDF 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_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 17364 bytes
SHA-256: 55a41759076e6f96767241686b8b28c72d27061537717e8df97bbebf8db1c8fb
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10624 bytes
SHA-256: 99fbca1003759f487fa007428ed71e7481a9aaf9274e3ce1f073b0503f550381
font_02_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1