Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b577fcbc6358c16…

MALICIOUS

PDF

69.5 KB Created: 2021-09-11 18:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 025476c298ac5dc377989e8ead342c2c SHA-1: 5489ec569e920acc5d3f71c8d2afc1d33af3bb79 SHA-256: 5b577fcbc6358c169976b84af1d95114ef1db86189d103a4249015ce260e1d4b
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links to potentially redirect users to malicious content or phishing sites. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=ajay+devgan+old+movie PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304d11e4d24---danonevigaxowefupa.pdfIn PDF document text
    • http://napiarsaigh.com/images/jewezilunilow.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/57695917518.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/8117563222.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/24219815294.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/janatebuwuferutozugasego.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613518cd5373a---lawulawisi.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/dilonolerexupefukemepefa.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/17170110724.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/88761519160.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/89825185738.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea975f3c01---25013834179.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2d1170804654440351f42fc4f606264e/66199960258.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/suzujezajozitevajo.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/monujenarimubimapiteluti.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/76521799781.pdfIn PDF document text
    • http://bienbao.org/uploads/files/17219668535.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2f494c087993aa600e1d9df41f3ee866/sifadajowiwunariwepefa.pdfIn PDF document text
    • http://cascad-trans.ru/files/remavosimaxetarok.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/87159737130.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/30853259639.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/xovozasofopame.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/lobelisidadi.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/10335253665.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/58580837607.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_off0000b18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18B 15528 bytes
SHA-256: fe1cc889c84c0fada7a647f0d5f63f41826573fb714bba20f476374bb7b57435
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 10516 bytes
SHA-256: c15d031e5779f6d1c674cc96f6d8b0705e7086fe6efe73a808ebf1088fcf3923
font_02_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1