Malicious PDF — malware analysis report

Static analysis result for SHA-256 a447eb97f209282c…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 00:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef7be18a7f2127b14b2d3d820e75bef2 SHA-1: 5c940471cff587f595b9329907b24437a2aa0544 SHA-256: a447eb97f209282c7573e72fba52d112c5511c9b0ed5c53764ffe4e87cce8e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme disguised as a document converter. The presence of embedded URLs and the nature of the heuristics indicate that this file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a19a5756---42572634536.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a49ee05b---pomevokupu.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/pexewepaguwozukobutenul.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3c6317811ccae1d56ddd37e0e0586b14/76414286845.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2466065c2---56750468481.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/er8m0963ico8eng1ngf7d18ha7/63967699678.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aba97e172a0---sugabede.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/53180290368.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/44417915999.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160841ce7ab244---vowuvesek.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a032edce3e297141718cd08aa09f5cec/231789422.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/faxebil.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/zetogonulafevubonomed.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084922ab4323---54843624490.pdfIn PDF document text
    • https://ubranni.com/uploader/files/87245121367.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e22b212abb1819058dace450706c98a4/61875539806.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/aea17e0144ef7b4db0a7eac92758ba67/88570325313.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e2c9fc44---2235418316.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/98320428555.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/popudojesolirokegilizi.pdfIn PDF document text
    • http://classtool.info/upload/files/xuvejuxes.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/24966061149.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa03ded863---ganeraregonoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+converter+docx+to+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_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 16924 bytes
SHA-256: d22d66ab95a7e65e58b2b46a945cb3209f0ff35768476fdd4e5105b53009cd7d
font_02_sfnt_off00012f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 10608 bytes
SHA-256: b4cf8ce1a43fd5f78d65f361d2fc7b653522e963085af60e4ddc4e3d4058e422

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