Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2bf0415e9163cc…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 15:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: feb934ff5be5be6bb649bd536636ded3 SHA-1: bf3eaeb48520f93f26dabed71f2d5397ddfe2827 SHA-256: ff2bf0415e9163cc89c9cf785b4065cd4d188a0fa30a527e81b0b45580e8a32d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

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 http://clinicaveterinariabilancino.it/userfiles/files/45418687479.pdf In PDF document text
    • https://sofupingame.net/calisma2/files/uploads/visapafitivefopasivotuleb.pdfIn PDF document text
    • http://packturf.fr/files/gidik.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/45604384467.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb8a68a7a---dubalagovudapod.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/61952677303.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/gelaxasezefejus.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/dafarixufofixigofa.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/didubakepofiverakaxo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/608bdc3836c0f2219f4041484c0a386e/96652612724.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161308fe55aad7---ripum.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/rimidapujufetonulag.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/8668108966.pdfIn PDF document text
    • http://alkanboya.com/files/file///48167604358.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/talogeta.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136469df2e06---kopulutusulajimeluximore.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/56401076217.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/92697411074.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/pazunatiwepumapijusokefa.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/nebokajizurejer.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cac9fd29---gupetuzekadusugo.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/612fa6b97c018.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/dunijobamogunolasibow.pdfIn PDF document text
    • http://identik.hu/editor_up/70062095587.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/mogugudujezamud.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/binawozuvaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vpn+settings+for+android+free+internetPDF 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_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10596 bytes
SHA-256: 71b4c2d956a0123635d9ea8ccc47974ba4b063f0d84047d6f29f9fb264002874
font_02_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 17872 bytes
SHA-256: 3006845f543890b0781a1502debeffef958c45aef36f32d513983ffc8db3061e