Malicious PDF — malware analysis report

Static analysis result for SHA-256 0330ec4c2016e5d0…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 19:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fba4124e21f3f3398837e789700f81d SHA-1: e23985674927be69c83312ccd0558a59438f67b8 SHA-256: 0330ec4c2016e5d04bc15401787718872507f8800dd1f02c6fb46bc2c4fa9132
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The file's structure and link farm nature align with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aec0c40e885---lazenofe.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afbac70b68d---tilof.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d40630f29f225b880304f32a9ae636d4/rinalem.pdf
    • http://arniestribu.com/campannas/file/sogapakavolamajomo.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/490f070cd4a878568b33e95c422c6f19/15423008196.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/u2tt4qmad5g4jkcopvivpbcg8a/sifelawibikisun.pdf
    • http://banlinhkienlaptop.com/userfiles/file/tejafudepojoxeluz.pdf
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/6329217311.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d7594a7c---6517109387.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6eca08858---bumetewadofawuget.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d54af43e---pokovezibajup.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffjk933b2gs598erubo1g66ql7/golutibujenaw.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a3km91tmuvmv3ockj611e4i4q5/vedejid.pdf
    • http://didocrosby.com/imagenes/file/nuvap.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d37f20466e---tujiv.pdf
    • http://sgd42.ru/userfiles/file/85680433943.pdf
    • http://cbwmd.com/uploads/Files/10821838943.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bea8e720d85---30973271063.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/segilejip.pdf
    • https://footballsod.com/images/ck-uploads/files/neseraj.pdf
    • http://dralituncer.net/userfiles/file/24734317794.pdf
    • http://omonetach.pl/foto/ilustracje/file/poxuregij.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3ufe7274kkvj3b6ep5f96ikggu/zotavalawujamero.pdf
    • http://s-box.eu/upload/datoteke/37156553495.pdf
    • http://intertexmedical.com/userfiles/files/lavepavukazibiforasona.pdf
    • http://pescepiana.eu/userfiles/files/tiranajejep.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=engineering+graphics+by+pj+shah
    • 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_off0000cf4a.bin
b1736f305dbddd5b958866f84247bfbc019a6f56e3fd04b354db1e14fef2beef
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 10756 bytes
font_01_sfnt_off0000e7b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 16792 bytes
font_02_sfnt_off0000ffc7.bin
28ce465e616c08d6185788757e09d06682b72efe343e0142afb64cd21d608bd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 17588 bytes