Malicious PDF — malware analysis report

Static analysis result for SHA-256 010444be8a1d9269…

MALICIOUS

PDF

77.8 KB Created: 2021-07-08 00:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b080138dd11c60b109e03526d77685ea SHA-1: 0d9146d59ca4bb800c16b0f9c14e3d6b9aae5c51 SHA-256: 010444be8a1d926994a314ea3f8cf8e391c0fb26b9aa2a304b7e25cb487e9f7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kaowei.tw/image/files/20210624_073122.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8000a332---fujimiwojufatorokoxobis.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e265010c---berowej.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d54bb6e9---zosajasabovedelizofegabez.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f474814f6---vusojituxinasojumojosewa.pdf
    • http://africareview.in/userfiles/file/69305637718.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d50d7cf9e71bce17f41a3319d4bd7c74/32355286754.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/114cfb5811b527553b92a17b583a74d2/20179393152.pdf
    • http://tikatalog.sk/_files/file/tegiforoxatejowak.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086958d482a5---letamarisisubajamoze.pdf
    • http://hi-techfiber.com/userfiles/file/masikumenudulenalumi.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160848889aff90---javupogomimazurobu.pdf
    • http://www.medicellbank.com/userfiles/files/lamum.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/bbd92dc6a083edcf478b6caf2333fe35/gijifodak.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/69224691026.pdf
    • https://csn-alliance.com/data/files/42416856037.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/fatar.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ef548e73b02f8fdae9fe320281fafcbb/95432416695.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/53a30e90ae4950791fc2817bbfe0517c/tibazemogifazab.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/uf16765b8pka1hmsah8fjsoldk/76940072177.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/vibuberokebom.pdf
    • http://donghozibistore.com/luutru/files/berofenewofixovegogigegov.pdf
    • http://annamsaigonlaw.com/upload/files/xivivekuwifomarujole.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=good+night+kiss+pic+download
    • 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_off0000cde3.bin
c05d03c46c97556601e67282d222884ee2a640fd797cde8cb0b0bf19d7b66359
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 10776 bytes
font_01_sfnt_off0000e683.bin
ec87624f32597bd9767aeaa65f916ce3f9212de75d3c5464a06f74be40d3756b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 16788 bytes
font_02_sfnt_off000111fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 16792 bytes