Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad72bcaf49777388…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 23:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 91fcf942ac4d3bad8f8ce8e1e930b525 SHA-1: e009d4be09b6ac73170e23618f1ca33e5284e847 SHA-256: ad72bcaf497773881e1c7c5f1adda82fa6c760d64d2f94746f93f8f60f0d70b4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised CMS upload storage. These findings suggest the document's primary purpose is to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=dinamicas+pastoral+juvenil+pdf PDF link annotation
    • https://michelbarbot.com/upload/files/roporavoduto.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/sexepizil.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/52904987338.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c4bef2bf2---84585252844.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/70788883886.pdfIn PDF document text
    • http://canadanur.com/resimler/files/8230113449.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4448b4ccad---pawikivezamamodexedurepad.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/lijuzakinogifiguzugetezo.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/fakizi.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/00gc216pc9ag3q61n9cl2jhas3/81976420732.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/13039167083.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/95662612226.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4661fa8dd2---kuwuxeriba.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/kivusizedopezopugajefuvad.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9f29d598---59984226655.pdfIn PDF document text
    • https://artenika.pl/fck/file/69632872288.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/tulerakelufigud.pdfIn PDF document text
    • http://houselandia.ru/files/48934557358.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbda7757eb---81951259610.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/bupinigaxavesunumu.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/xugubon.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca858d5271---rosizepobikilako.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/nonobasomemuxajakunijebor.pdfIn PDF document text
    • https://lecachet.fr/docs/files/31576192072.pdfIn PDF document text
    • 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_off0000b5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AD 15896 bytes
SHA-256: 7971bdff7e8cf4e6761566bd602b742591073dcb1404029951f05795373bca7e
font_01_sfnt_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 11080 bytes
SHA-256: fc589c53f4523ae313782944375e1bb2aceb51610aa514d2967f15f18e7d671e