Malicious PDF — malware analysis report

Static analysis result for SHA-256 a865f0002b03297d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 17:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6a7dad3613b6df23ee64500d443032f SHA-1: 91f3a63c8d8e014fba6d42f6bcf564133ff6b972 SHA-256: a865f0002b03297d1324777930cb3df44d4317c1ee2403bd63f93d986f69a801
96 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external, potentially malicious, content. No scripts were extracted, limiting the ability to determine specific execution methods beyond the PDF's inherent capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/aab0b4257003cb20b7ddd464392bf593/fikifexegeruxizovitu.pdf In PDF document text
    • http://poltinka.ru/userfiles/file/79408394338.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/26821861293.pdfIn PDF document text
    • http://epmachine.ru/d/files/72413758906.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/7e1a75a8254fa60012126f8c9119aaf5/25896943486.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69ab1dd93---gigowolinamiwaroxovor.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/82459972992.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/tameze.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/28352126837.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210822104501.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/35a620bea51e564658e6acc7ab152997/51205726314.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9bb83006e37a7b0755f6a5d2b5b612b8/36786376284.pdfIn PDF document text
    • https://yellowstonewildlife.com/mebotibedugapomubemuves.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b83ebcca61---43060709550.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/95654f43e0ad9737cf79343c0ddfd9d1/47693652034.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/49917309971.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/515944690.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7ac6a42eb2d6dfb9a0451a7bad1d07c2/58529211500.pdfIn PDF document text
    • https://hirurgija.me//files/dixelumixupawagap.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/44287957533.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/56953d64f03d10789f50d4fda601d116/79078563038.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/nrtngcbs2dfr6974mhbm0p34k1/nazajibipewusom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=contaminaci%C3%B3n+del+aire+en+cdmx+pdfPDF 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_off0000d138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 10884 bytes
SHA-256: 5cbbd0758046bf47ec76b6fbc16696d7325cbbb626570908e40423a3d3932308
font_01_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 18624 bytes
SHA-256: 0fc32d1739d2cd04e5d51959f383f9ff64e767c71b1a6b39428fb4920f8d4f95
font_02_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1