Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcc804dd5ec06ab…

MALICIOUS

PDF

133.9 KB Created: 2021-07-25 03:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b851cef6b47527621476b97777a52c8 SHA-1: 5a441c5ed9089a13aae310d22e7208ac71c61563 SHA-256: bbcc804dd5ec06abddf7534460a9511ca0c50e5176612674c110986c6e8d6f4d
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest it's designed to lead users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/66df39f16dcf14c29bc7fd51e6508aff/kumegeb.pdf In PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/474f5985f5b549f9fca248c8043cc0d3/togilujug.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/lebediritulizuv.pdfIn PDF document text
    • http://arslanemlak.com/E/file/34123065108.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0701554d---lufizomodotilafirogeri.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/82207141767.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/rezabaxa.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/daxezudinejarenanexufoxi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160939bd4f3cd6---riwipenasinego.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0083ce0553---46549469415.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160724bb984867---86443806627.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/85032061233.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f116e6c3---17753415110.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/funofogixekatunu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a1f51bfab---xomunosemurizumebejek.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210707111759_x99mgj.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/tixeparox.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/51307128794.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/lpo2s8cljku80pn210tpa0id44/86554781007.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7f78e7ca7a1b25055ab6412275c006a8/bowobuwat.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd13ad4d46---88837862662.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/rokukaw.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/relujinoka.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad65d5e70---vamijabuximegefonaj.pdfIn PDF document text
    • https://irantruck.ir/data/file/70505639516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=engineering+thermodynamics+by+rk+rajput+pdf+free+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_off00019f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B736 22728 bytes
SHA-256: 43160ce4c0ed01fa109d4160aa2bd4ab7e1edf5bf1dfd2e981b42aee8048c361
font_02_sfnt_off0001ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECE5 11712 bytes
SHA-256: fee766b1cf5a42568d4cd27e9fd62432aa5cfb9bab1eb05914e38a72e558fb2e