Malicious PDF — malware analysis report

Static analysis result for SHA-256 2584416aaa9347f8…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 18:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15876cb4e320905be0b58aa40e34834f SHA-1: 2be22c154bfe71c9136ae1222e251d7da6b25203 SHA-256: 2584416aaa9347f8b87f2a49e29a3859ccc73ecdda601a053ee209fb3fcbb350
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. The numerous external URLs, many pointing to compromised CMS uploads and disposable hosting, suggest a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to external content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=leave+your+mother+and+father+scripture
    • http://buergerforum-tirol.at/file/nuvizid.pdf
    • http://chinazzjx.com/d/files/mubetapoboxanur.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/06f8b81699c98b067c672ce5173d7b48/sewutunogivabubasoximol.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/banelqisdnr7bga4of65u68vl4/79975451560.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/7000662121.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4914d57473---winomanuripasubatu.pdf
    • http://jr-bang.com/uploadfiles/20210606192629.pdf
    • http://danies.ru/ckfinder/userfiles/files/redurimewadirawapi.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6e6508d78b729f6e6726d90e7b198f5c/55240057577.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082733d562d8---lalipogusise.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5f3406040---74001523525.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084404fc9890---15129463968.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/76551509609.pdf
    • http://lungshingcentre.com/userfiles/tobebewevugenigunataref.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce27591fa33---49078612805.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/49064221409.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96903d284---wezuxinusojibufo.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f08d92f3---pezegugef.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2a33391e---sidazitijutaserenoxupan.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608390aa6af8a---4175142242.pdf
    • http://timandlor.com/userfiles/file/16335812273.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2e0938c5fc7f26393f5f29337a06b8c/kibevopefawiperanigo.pdf
    • http://heibldr.hu/FCKfeltoltott/file/2695699351.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/38fdf65acda68280c5c2a0e86e2b319e/bigeruwibo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a2.bin
cf23b193741a9e4db2784f08a8a989ba20f9f5e34196ac092328fbb18e5edaa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 11076 bytes
font_01_sfnt_off00010351.bin
3afebbece8437566e9043c66928068f5922ac8b7de40d3d46af792d2748324ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 17104 bytes
font_02_sfnt_off00012f57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 16792 bytes