Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f211ac77aae89b…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 06:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13da0e9148f38ab42963fab4b78485b2 SHA-1: 20ccc4baacbf1be2d52c1d6c58dc36e306050d60 SHA-256: 78f211ac77aae89bf0798b7b3e3443eb8719eee85542540a2ef48ace40587e65
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://paitoonbox.com/userfiles/files/jijawa.pdf In PDF document text
    • http://bastola.org/userfiles/file/milokorufim.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/56704824331.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/wuxumavazivaxezujog.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/80312254983.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/vuledibaboge.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/4110905533.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/24211141840.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/zixalutajubiw.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/dadidovodiwodiloxati.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/retititojugofatoto.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/44311166758.pdfIn PDF document text
    • https://salonorchidea.com/userfiles/file/rikagovefivelogifefakof.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/kekedap.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/moxiwegukokujoporor.pdfIn PDF document text
    • https://atavio.ru/files/file/79772200693.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/fobalu.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/denirilevakolivuva.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/034b8d8e02a3e31b386900e1f6ae2646/73573699637.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/mulinekufosijorage.pdfIn PDF document text
    • http://synhbio.com/upload/files/16585651075.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613238f6b5aad---pikekosol.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f45801e0---43821809694.pdfIn PDF document text
    • http://chamdure.com/DATA/files/38491379552.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/rineduzep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=canon+in+d+easy+piano+pdfPDF 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_off0000b134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB134 10392 bytes
SHA-256: 64d0711cf49b91d606db6e82ecaf808a60213d5f443535de19f639e9579b8ec0
font_01_sfnt_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 15560 bytes
SHA-256: 31cbc02d0eec258baad48488f98d6e4868a18755f15c46d902d6830ffded1cbd