Malicious PDF — malware analysis report

Static analysis result for SHA-256 c784c107b44f2689…

MALICIOUS

PDF

89.2 KB Created: 2021-07-01 17:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9769965577142a3edcf90a7e02c6fc6e SHA-1: 205e5cee2964113d9b58a85c7d05253e3048b8b7 SHA-256: c784c107b44f268903b9dcc378e7d6c96c369f3e7543edd91b01c90dc32cdfe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary function appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://proxima-design.cz/files/file/63777502094.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/d42gknsbfkstr5uccp32o57581/51367901793.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a85eafce536591af751ff47bb40976a8/jarogubofikiwe.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0k8r6gh61glum0pmanheeh1qvl/xojibol.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/16b4c45db52b5b392a60238e3698a1b8/gavizokinaganisezuta.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/alum6k440qu97jci9nqhel2lae/tokub.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/71128c0dcb2f2e8f24847a15e22cdc0f/90735672619.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607177f8716ce---42253617508.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/052e4040d0b5147b99f5931fcddd409a/lagetomu.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/norudamezefek.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/d20db495a2239ab6d2d7971346f7497a/nunurizowib.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2f9be36599b415739628742e4342ed4d/subupewovifuvejisilim.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/37514979529.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/92675527367.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782dd4b1301---34211360691.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/lixubawikolomifazemasili.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/81430787630.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/kapebanatodulinaxixenawo.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/lipanekafodovokaga.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d7c04abe---49109346951.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/gus8f7deg6jj6kij9p1527363m/22802087912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=prosperity+meaning+in+tagalogPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 17560 bytes
SHA-256: 60f104d94e85db736c5ae6d2ad9e239e7ee66772b9da55900c44cb2a35d81f64
font_01_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13361 10712 bytes
SHA-256: c18908124963f2b74a27a205f71e6e5ef2eae35715c4f5bdd34ca38227f1c70f
font_03_sfnt_off00014bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFA 2648 bytes
SHA-256: 951bb254c5ad0dfc9e6d9db4c20d328e7409c8363f96037e148a9f756b3e8fbd

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