Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaaf7dba8a8ad0e…

MALICIOUS

PDF

93.6 KB Created: 2021-06-27 12:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f0d9c938b53a642c59e2adfc9104dbe7 SHA-1: 4c3dc33368a7b344db273cb39b966da0ad5b5d9a SHA-256: dcaaf7dba8a8ad0e6667c4e37022a92cc61e4713a37aaa4e741b6fec5d41f620
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to host malicious files for download. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to attract victims. No scripts were extracted, but the overall structure and URL patterns are indicative of a downloader or redirector campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b13a9351---refowovi.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9a5b86eef3hu21g6o4kdq6nd37/morowirakatanoba.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b0ee37632---73539573180.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/tbbhm74hu4tsir7e062b47i2ap/moluk.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d4c14ba74---59780548171.pdfIn PDF document text
    • http://planbmedia.hu/files/84842111596.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/uvmrr08inra2146elr5v4ng3j6/batodelobibid.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3120687a---zorotigazonexesugi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb5233ec4---wijazilegogoti.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/rerulefuk.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/736240297c80ea3978cddae6b633e184/jetesi.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/43044095356.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/nadopapemaxigilidemik.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/65802014870.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/panosimiremededojosater.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/72778890713.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e00b135b---dawiwasijar.pdfIn PDF document text
    • http://gojjang.com/uploads/files/42494101826.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47d0d66694---vutufumezopi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/db05ca54a7ec0c454ca977ec30579e7a/7032350844.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7fv9ctue2e66t42mn1m29uai60/milot.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/memeguj.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896e77b309d---tekug.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d9fea0f23---jovilep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+fire+hack+for+pc+downloadPDF 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_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 18572 bytes
SHA-256: c83875cf10fc09c21dfcf8f13a02ceca4bcfb7edfdd6864099a98e57f293f34b
font_01_sfnt_off00013915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001512c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512C 10604 bytes
SHA-256: 726f56a5257393994b580ee68abb98c3e9c29b27d996901cdc899ae047bcd211