Malicious PDF — malware analysis report

Static analysis result for SHA-256 440d99d724c0f0b8…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 01:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef1912ec9714ed5c473185c49c8de7ec SHA-1: 18d134ccfd766a4b55e084cebdba99741c98a422 SHA-256: 440d99d724c0f0b8d1b723aaa4ff728911bd8666cac330d48aeca718ef0ea9ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb21236cf1---fovezasusedogipibesi.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e922c6a524---paruvumumobi.pdf
    • http://4grd.com/cmsimages/file/vutatasabaxebag.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/m2t6soi8mct93r5f8des7uekh6/36179802805.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6cb179b866962e479d8da981d17ed424/womixefil.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/81a6vdjbecj22p5s211mm83m2u/74278506114.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edfdbcccde---52816108614.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983fab724b---94493393242.pdf
    • https://rajaunited.com/contents//files/ripavoma.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c75419ba7dc192ee9e4e768ce0f99c75/bulusujuwinivosipagama.pdf
    • http://kxnjl.com/userfiles/files/kaxekokudalaxonudabukarek.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbfc2d46e7---91094551382.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f53249a4d5---13681991686.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f183527dd8---54621501660.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210518193827170.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/odt5p0bmtfpk2u8qov6en7j715/9373969369.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607783aa08d03---dezedakunivemaxiz.pdf
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/viduximi.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/33990943804.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077db702a6fe---64259949635.pdf
    • http://massimobertoarchitetto.com/userfiles/files/34811469953.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a59872a2795---depida.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mcq+for+class+10+history+chapter+1
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986096c4f9e---kavawowizixun.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_off0000ef0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 16792 bytes
font_01_sfnt_off00010721.bin
361c9a3821e2b262b346a53c2a9df909f6ba432aa3e2343994332e9761e4873a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 16728 bytes
font_02_sfnt_off000132cc.bin
f9dfb664e71590324f01b529c1664491a8d47870a519570957e752d9696ba4fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 10900 bytes