Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c9a596680e537d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 01:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c8cb50ab8a0d5c4b737e176fe26b025 SHA-1: 7703edb6ad0a1ba15b24f9dba630b21174bc4765 SHA-256: 94c9a596680e537d04df153847e770c66e4ebd502771f3e3e6d33ec15c951efb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://avanti-kuhni.ru/upload/files/mavas.pdf In PDF document text
    • http://yanartekstil.com/firma/files/91959895316.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/g6qe1bq7kb8g94se82hordedd3/90881447515.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/75625802673.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/76514015171.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/xuxusumanupavoludek.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6soalbf12jn1es7clodm3rgpou/legun.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/84772895574.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5938d8fb161b88df0b804b282e418323/riwaxotarulurupizufedov.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/zisur.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/82904915179.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/rasevagidarenenisu.pdfIn PDF document text
    • http://web68s.com/upload/files/buzozi.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/vn8cv462a06m6sg5lm28p953t0/denevomilodevubirefuj.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e1cc9bf50---10926394015.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/9fcadef500e01b1b44edcf406ca927ef/nepinikenuzepotaw.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/olr5d2pjsf9ufvlk14p2g39j47/96545481900.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/goremexoxidodesafowif.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/8655800887.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zokumamadase.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7057c8b6d---60088820752.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/22625377602.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/44947150179.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091987b52c01---97562416624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=projectile+motion+class+11+ncert+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_off0000ced6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 10964 bytes
SHA-256: dbfeec720d5b94db2fa95d00390b7ba2ccb2c717a3a7ccd545cb3f7aa3c32ac6
font_02_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 18640 bytes
SHA-256: 26b80588253871f8142d139368abb4643f5650c3f5b671d10c6e7055e2463e8f

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