Malicious PDF — malware analysis report

Static analysis result for SHA-256 9558ef157ea895e6…

MALICIOUS

PDF

68.8 KB Created: 2021-09-03 01:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b94a7d973d266097fecc3e8c96de8402 SHA-1: 2fd90b701177d14d9045c080b0ae8214c3b2e545 SHA-256: 9558ef157ea895e6ee71f5074eb4bd0ddf2e31c3faf42b15d4df900e4544b46d
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by an ML classifier and exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. Several URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. No scripts were extracted, but the overall structure and link farm indicate a likely attempt to lead the user to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://denizlihorozu.com/resimler/files/voxekilugobevosenu.pdf In PDF document text
    • http://novichiha.ru/pic/file/95579525317.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e565470cd---zuraverubusaviloxusunet.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2d247e8a37a3905bbf708b1a83c2807f/legedenilepesexet.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/vupafudazaguve.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106231903044088.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f92cc0a2f2443e64adec351bdbc412ba/bolejikedozeguv.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/91085391807.pdfIn PDF document text
    • http://tulga.ru/editor/files/besekev.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/tujoluxopizufulafi.pdfIn PDF document text
    • https://combrooncom.com/contents//files/25545723423.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/9419691477.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080787511a9f---webovuvepunukow.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/misikerelewapimobawuze.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zokefawer.pdfIn PDF document text
    • https://masukpt1.com/contents/files/97307749932.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/96980485378.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/51074891953.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/69298125380.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdb5c661a1---59575995967.pdfIn PDF document text
    • http://azizolace.cz/images/file/kasid.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/83adc4cbc39c19238c556963f0c88a0e/fidava.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/as87nbguj8v0v96to456jeql34/japumimapolifupijipufen.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/mipijawagupopepexap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=convertidor+pdf+a+jpg+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 10732 bytes
SHA-256: 3af3b8632c679750050b4c2cda47f8cf4b115bae48933eebf12ae84c14133ad3
font_02_sfnt_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 14388 bytes
SHA-256: 510d3db8006c486da9cb9a8397c2fc7213105cc6a31e138941edfe17e67fe809