Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc511d58b48ffaeb…

MALICIOUS

PDF

87.8 KB Created: 2021-08-25 09:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac31a6912a7e85db2e40a5f5a43f1d06 SHA-1: 92aa73c9b499f8e8108800f7ae5ed1f3f1b9e9f9 SHA-256: bc511d58b48ffaeb4bb25c948d94dd0e8e04df1b1df6267dce48558bfc3ab971
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF acts as a lure to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomorecpapmachine.com/userfiles/files/93245935883.pdf In PDF document text
    • http://aliglobshop.com/userfiles/file/67223591902.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/db96e0424b1b5f236afcf55466a969c0/javazogu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e527a0a0---fepilifidubiwomirigum.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06fb19575---14876930381.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/80127521363.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210806205129.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607084691e2ba---97171262752.pdfIn PDF document text
    • http://roocenter.ru/upload/file/posatelowefo.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/77170000280.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/jagorukeriroziresur.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/rovipijexagu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/deb4926015c75036f06551e99526bee1/bukekotopobone.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/vawerugatawer.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa1a944dc---pikezuvi.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/23926338806.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/3vgeb1rvm6f6abimvrt7f9pq9k/koraxaleguditu.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/lapevivizetupodiw.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160961716582e9---xilokexopesalowazaxade.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/72645863378.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/88403458529.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6fef6ac08293296b272d8ab8d572c0b3/xuzazoxarevejulorufajinug.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/tixeritigabivotunenetinaw.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/14527577149.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/88682914841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=character+reference+letter+for+scholarshipPDF 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_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 10608 bytes
SHA-256: bc951ca8d5f38fe29970b0b13090d6df8d1dfa57be4e7d09bbf67cc6d758c95c
font_02_sfnt_off00012413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 16656 bytes
SHA-256: 0f72640550373df875921ef8f32c3272eefcd7cde4d5772ba008fbf6e1763f4f