Malicious PDF — malware analysis report

Static analysis result for SHA-256 e327ab342b46874e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 23:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: efab3dc115ff453e0824c9f4df0e8c12 SHA-1: 4d8fc38760d91c2aab7b09a500a3d7fd89d361d4 SHA-256: e327ab342b46874ef0a97151d584407a7f3a0080cc0f8cdcf3bb6e7d9bdfbe51
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous links pointing to external websites. Several of these links are hosted on domains that appear to be compromised WordPress installations, suggesting a link farm designed to redirect users to potentially malicious content or for SEO poisoning. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c660aa8b7f---32702483708.pdf In PDF document text
    • http://dr-temt.ru/images/file/rodobivewuluxo.pdfIn PDF document text
    • https://esz.jp/img/editor/files/38383196862.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e351bb8eea---38342123033.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/v73jdllntj2meqebves6brkbd4/funotorizoro.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/vononodaxepanod.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/5408611233.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/xosejosogezoromadujo.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/nifamirevutujimolupoxipuk.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vudug.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/12278864780.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210912024830-10654724087.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/95553155584.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/tetizasetiwofikibutorodek.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/gevarurofanakojunidusuk.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/silitasepabafunujewi.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/9318274367.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/3477762167.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/72909251447.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/xorafezadixawul.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72a584cbc---tawif.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/rojitupazunevomemajeki.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf9187148---vemupisofimerosadenod.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/lusidavudixipulekozeribi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=real+racing+3+mod+iosPDF 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_off0000bb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 10832 bytes
SHA-256: 24826d7337a6b40196ac63501feec6b8353ff12e3cc9dc5fe3cfa64bc942d67c
font_02_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 17592 bytes
SHA-256: 1c4c546bb6278100cb9125af2cded37bbe03d8e602df00628ed6b38e31d87724