Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1b82c13d0f1ead…

MALICIOUS

PDF

87.7 KB Created: 2021-09-15 02:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ffe09cd0edc6707d134726e59d5f7c3 SHA-1: 2e9c8f551018227df667c02b6bcac976541b4a17 SHA-256: fc1b82c13d0f1ead2656712f269db57b5452188c1790385f4ccba271590cd943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=best+offline+java+compiler+for+android PDF link annotation
    • http://innotec-industrie.be/userfiles/file/37992296153.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/kodovisijubelevaga.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/33836662404.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/53878781450.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/47689427223.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/85175998191.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/45228330588.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/30162230256.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/20781609894.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dd4651fb2a8f2194734b4506435e9d9/79698289772.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/wudomawamojezuje.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/33590641715.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/32407601890.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f893f59351---pinexufunifovamoda.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161344841e1791---notibip.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccc22be694---ludodoraxagefow.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/71715734011.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/70205856314.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/lasilimufibirusem.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd380bbd62---majadorabusibise.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/bisuxuxinipet.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/femerosobesu.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/17273576218.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/xelogerafujevuwexesak.pdfIn PDF document text
    • http://ymmicro.com/files/files/34686676837.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6129ae32---zusawekek.pdfIn PDF document text
    • 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_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 11028 bytes
SHA-256: ea4dd3aad2534a6a820e68adaaf6187c345bfa639367c85552f7366b561bb24c
font_01_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 18360 bytes
SHA-256: 78edf99f716cbe74227a0ee3158f51b8f47a35bdb33af5c7c6bb977cd40d70d1
font_02_sfnt_off000136ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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