Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b43dbf15ebadfe4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-09 13:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e443ae18958241ab4fa7100e5fcfb960 SHA-1: 0474f468f8d7cc2d29dce7bf9d24e4471583d579 SHA-256: 7b43dbf15ebadfe40ed17deb05c6d35cdbaf44261c5318aec9d4b0a92b273f2b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and does not provide clear textual content, but the presence of link farms and compromised domains points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.miyadenthai.com/image/upload/File/62578729439.pdf In PDF document text
    • http://campingwithconvenience.com/files/files/58300222503.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/18117925020.pdfIn PDF document text
    • https://vitanov.rs/files/sokowafunotokolegulijek.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338f4f70f6f---patifupijawosesajufe.pdfIn PDF document text
    • http://darec.sk/files/files/mewepeguzena.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/zizavikigifugiwo.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/54424384018.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/vedixabe.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/30319844549.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/nojokuzejaferovol.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/62968831170.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/64484007164.pdfIn PDF document text
    • https://susta.vn/userfiles/file/biwewisog.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/7476858897.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/25029388202.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/83439819345.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/rosemox.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/fotokiwogumigutamezupez.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/59943369828.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/sanifekar.pdfIn PDF document text
    • http://hainfelderteich.at/lekabarevoletosuvesubizo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a872507ff---80411461417.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc1b4380---53049172181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=themen+aktuell+1+arbeitsbuch+pdf+englishPDF 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_off0000bd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 17876 bytes
SHA-256: b87b8b7859b9953d9044e93b732ea85b78d2c7357fdd9ac81491c3dbc6939e73
font_02_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 11296 bytes
SHA-256: 8d27227839f29bff28a16bef6d124443331068bdf79d523a8e307949ae785a0d