Malicious PDF — malware analysis report

Static analysis result for SHA-256 23459480c55fd8af…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 19:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50cd83cff253897165c086c812a40f2a SHA-1: af1b4934c8898f019e668743a31611ddeba00b87 SHA-256: 23459480c55fd8af93ca76f9618f79513bb07a19d950cd9cc5dab5f6fcb04f21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver further malware. The presence of a 'download button' heuristic further supports the lure aspect of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34185834597.pdf
    • http://tidomusica.com/uploads/files/202109040429398678.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/wigowabizerowe.pdf
    • http://vandientuchinhhang.com/upload/files/89282114709.pdf
    • https://bd-sokolovska.eu/userfiles/file/rijowafin.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/bajazenimofakapib.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2480f33007fac7f0bb7d6e6964035c06/29859835808.pdf
    • https://karapinler.com/calisma2/files/uploads/39664356954.pdf
    • http://vuason.vn/upload/files/gugebedabowufo.pdf
    • http://perfect-gallery.com/userfiles/file/xipapibeve.pdf
    • https://zlato-stribro-investice.com/upload/files/29831370184.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140192179d2b---26246989056.pdf
    • http://podiummoda.ru/userfiles/file/44788730496.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9ccc3cb8---9084153468.pdf
    • http://fantacyhandicraft.com/userfiles/file/womekojelazefadugewip.pdf
    • http://ducnhua.com/upload/files/dosevozovosu.pdf
    • http://www.jindatunnel.com/up_files/file/laruwadozokizutumu.pdf
    • https://spacio.hk/attachment/file/rosupegexojavogefamiwu.pdf
    • http://dallapietamarchisio.it/userfiles/files/kipusivuxabu.pdf
    • http://dreamsurgerycn.com/ckupload/files/bozodusupad.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/vuterenewigelowimud.pdf
    • http://profstil.az/userfiles/file/8985779205.pdf
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/godojojunu.pdf
    • http://seattledesis.com/fckeditor/file/vivifobagafewekuvatigiba.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e191495649---58756694483.pdf
    • http://jessie.vn/images/ckeditor/files/84946350372.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+multitrack+app+for+android
    • 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_off0000db96.bin
a55689f9bf4f7d8e39b858e63745bd7a884d52bd4a30303a2d2388e8ecdb12ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 11024 bytes
font_01_sfnt_off0000f531.bin
471eb4f45bc0993a7fab7814695368cca2ef90c64009ad887ebe6bf561fb58a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 17268 bytes
font_02_sfnt_off00012175.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 16792 bytes