Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb3339550eaa80e…

MALICIOUS

PDF

140.9 KB Created: 2021-08-19 07:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fa8e88638e55e312984994199d450980 SHA-1: 5f501139a5b867650910e27a6395497c9fe87875 SHA-256: 6cb3339550eaa80ef60374df8ed36a50955ce2e2068643a3ff54e73a51d43f4d
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607442c293cdb---38636198145.pdf In PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/ronererusabi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf59a5f65---83917087276.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a2d1e263---96442338732.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/selifat.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215202316234461.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/94983275022.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/tepigu.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/1e9a71aa14f64b6590810ea7e3ff500e/18074013603.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/ko5m9dt44f7l16ilqcod5gmq3c/rasunexomos.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/82742171815.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/81abc7c6bf39d995bd67769e3773ca1f/11471410166.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94bf8160e---29808108433.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e05893e09621e10cba1542bba42ffbe4/tabidirexuzoxivolaj.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/dajamaweganifufekafapupo.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/82284769887.pdfIn PDF document text
    • http://ipceurope.com/assets/file/38935326786.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210528001720.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d48279ab4---bifofudukelojusafopitataj.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/21646633203.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/pesezone.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/setatarisu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/800da4e3f1d05828045a7bcd3767c6d9/30612479531.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079e00ba61b6---57932336949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=peliculas+de+accion+2017+completas+en+espa%C3%B1ol+gratis+transformersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A22D 20152 bytes
SHA-256: 8b0f2a63305385c84e3bac11bb7e96b38b6b0f32d2906a614f76e4d9ec0e88a6
font_01_sfnt_off0001d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D69D 11616 bytes
SHA-256: e5f944d568b76ed917ada56a61f27e2cd2cdc85ee265b6b72d15f9ceb3ce7875
font_02_sfnt_off0001f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000209f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209F1 16944 bytes
SHA-256: ef0329dac4803480f2d6f4d9e9c4ba3aed2817dbf0857a17f9b8becfccd91a33

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