Malicious PDF — malware analysis report

Static analysis result for SHA-256 33da45a26e6f8e5d…

MALICIOUS

PDF

76.1 KB Created: 2021-06-20 13:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95e22ba1c60c0399a45e0bfd29e9d16e SHA-1: 382b90bad6fc60c44e08b3d4b69df5f108538a4a SHA-256: 33da45a26e6f8e5d6cb2108459ec9ffba4473909720307d7c8b477f68c1836ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c95fe9f386c---kametojozozujinenijeguge.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cb9a3f10---lutamiwugafejenanusokebif.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3bd19003ae9a783a717e7ef6d5a0510f/xigojepa.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/c5bimjos63ejqktln2ok8o72pg/rosodidabesipar.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/862fb960ecae20ce05a1ea44e6570850/37502248991.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e78949519---digumufitijadozuwonen.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/is9fv8k416s9n9kb33qe8vkk32/boxekezibugapotopesik.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5f07901b4b530b4e9046034aa8f7c098/22375748779.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b196eea7b86---padivosibuzoxukepedalub.pdf
    • http://bright-inter.com/file_media/file_image/file/35332554395.pdf
    • http://axwelindia.com/uploads/jujidogerajuluvedivomun.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1957ec902---tawapig.pdf
    • http://work4shop.cz/userfiles/file/47638994011.pdf
    • http://bioscipublisher.com/files/upfiles/file/kudiletiweje.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160757f43b0edf---97048464276.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bffd1f9c---sodajupifafoko.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160858816b5dd9---topefowozixebujanud.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160910c4579637---73244280729.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=car+stream+without+root
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df78.bin
2feddfb19cc126ac94c94150ed2858ddcf459a9daa9cd6e53c4c9ea0bb12898d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 4784 bytes
font_01_sfnt_off0000efd3.bin
0c3535614a953643c9d2b7db01400d2f11eaa35d4839891618847109d748b7f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 10704 bytes
font_02_sfnt_off00011419.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 4324 bytes