Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd013f150b4002a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 21:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8761432c7786e6a84e8f372faef6ed23 SHA-1: 547b083ee37def8092b9622e71069f897008248e SHA-256: fcd013f150b4002a0e4f6ede1b5b969a96450110b3e970e9378df01a98e9a013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/obmdinjhpepcecshpo7j5i0c8n/topuwikuburojuvinologibuw.pdf In PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/4533977322.pdfIn PDF document text
    • http://maksimetall.ru/files/kufekuwugimuvo.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/foxin.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/pijubawitadumozipowafaf.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/zovanupafuvulo.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/jefuj.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/fuwix.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/jubexewabazulikaraw.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/13924217334.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9dee031c83f300f1a64188ac5357dc03/jogiwovilu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/45347992135.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a71d5a2bac---43425328531.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/bitowekitoselezarufusaj.pdfIn PDF document text
    • https://network-italia.it/file/24392994628.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/56277277448.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/25892494034.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/64599163692.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130940975ec0---2241095328.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/sirorenofopupifalikota.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/zejoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=east+los+high+online+freePDF 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_off0000c352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 17344 bytes
SHA-256: 50cba144a2804b6ab463c338f830011abeea9b099d386d367676ae88523e85a2
font_02_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 10476 bytes
SHA-256: dfba1e63c7090eac0f6eadd190e95d266411d4ef103d31410e5c849aa2408cb4