Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00d74945c9db675…

MALICIOUS

PDF

147.1 KB Created: 2021-07-17 05:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14937775990df42ef2e14fc1c44eaa79 SHA-1: 6a4c5892a7c84853ac24e6163ded26407249ce46 SHA-256: a00d74945c9db6754c902f27bd63960e3f7cc0c15d40b3609fe84061aa917cef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm hosted on compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the presence of numerous links to potentially compromised domains suggests an attempt to lure users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608883fe5e31f---98732747865.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb0cf1c3a0---11562162929.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/12105675431.pdf
    • https://pima-alarms.net/slicice/file/kaxaxexegipizijatofa.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5047bdc098---sulagitasalanifesub.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/27e309a8b3a30baa9ee12c64357100e5/nuxeboxalovemafez.pdf
    • https://digitaldaya.com/imagenes/file/zenonexotamejofefewajaxo.pdf
    • https://nexusmediation.nl/files/giredijaroli.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba91242ac---silib.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9a144c4f857d8b54d36a5e20ca19bed1/19369852810.pdf
    • http://kalmi.ru/upfiles/files/15171946337.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/pemozalonenowezoroke.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9d3abf805---31769254791.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/20105390280.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6651b776b---gupuvuvamulumuvoduwuva.pdf
    • http://botosani.ro/img/uploads/file/rabik.pdf
    • http://lovesushiscv.com/uploads/files/midokoniretubowileba.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfdb1fb8a---lovazonigizuvukemese.pdf
    • http://cancunday.com/travela/img/files/pewizegi.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9peap6h563cjco8goqdtffqen4/38333048708.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/vixitibanixidepoke.pdf
    • http://royalwedding.jp/images/blog//file/tadisoguj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=semper+gumby+meaning
    • 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_off0001e0ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0BA 16792 bytes
font_01_sfnt_off0001f8cc.bin
2cb4f96d6e04334359db06ca20f1663fe9068be082e86fa280c735437a274ba2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8CC 17648 bytes
font_02_sfnt_off00022703.bin
2113182cc34bb64365c874269941791bbff97350121f49b446dbc22cf6ed6786
pdf-font-stream PDF embedded font (sfnt) at offset 0x22703 10592 bytes