Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e335e86150f083c…

MALICIOUS

PDF

90.1 KB Created: 2021-08-25 15:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc9d5bdb43ed72c35769e68daeb376e6 SHA-1: 65177fe92c786724ca27861a72da29071475c985 SHA-256: 9e335e86150f083c7f1c4db4cdf00e7e772f5ee94390bc0e3aa6e6c7e3bf86f5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to manipulate search engine rankings or track user clicks. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7646

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://krisoc.ru/uplcv?utm_term=thank+you+for+writing+a+letter+of+recommendation PDF link annotation
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078e282a803d---weligifudemurizekilokum.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/tisuleto.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb46233303---xosazipezewefuvarita.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/66785319652.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d68840020a96053ee426bc57cb46b23a/saruvelexi.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///rejolotebibigidizivuko.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/dogiwolexuref.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759304875d4---68572483531.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/u862b145t7vkfm7blb2i9s1u69/76167067526.pdfIn PDF document text
    • http://parentini.it/userfiles/files/nutojomagabejuf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5e0ad5f10d59b3e97ef9b5451ed2ab06/xadakux.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/dewupeje.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/98006078770.pdfIn PDF document text
    • https://doitoutdoorz.com/file/IqyZOHsgxXCiCRpU.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210715_B9CC9051FC33F7B4.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/fijekadetirodiva.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074d32d7ebcf---patuxitasokinupepi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nodofuwogepikisexeka.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ed007d836---vimelitimobuda.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/bapesalamexubul.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/velezalibakinurizufaziv.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a594f8edc5e---10568204256.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace29c8b47d---zanimujopubuzafeb.pdfIn PDF document text
    • https://sambelteri.com/contents/files/witiselodub.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/796c99616a74b6258df2a5571aecb5e9/62073067207.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1028414e7888aa97adc5ea8f79125d8b/lupezup.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 11108 bytes
SHA-256: 2a9e92932aa08c137828e494a98e5a7b8599e66b9ba0530ac049637733e42adb
font_01_sfnt_off00012309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 16788 bytes
SHA-256: 8da1c52bc9af945d7a5d4986ac18e99fade02fcbeb1d2cd398da4ff77a06be94
font_02_sfnt_off00014ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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