Malicious PDF — malware analysis report

Static analysis result for SHA-256 143df3b4a9324653…

MALICIOUS

PDF

82.3 KB Created: 2021-08-04 08:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c7e91e3b03e3637d901aba059e351b8 SHA-1: 9a05ce53ea20186d4adb8acbe9415e368b9655bf SHA-256: 143df3b4a9324653bd972ee92671195f35f2c58b92b752b38ff06d350eaa123b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely for SEO spam or phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it may exploit PDF vulnerabilities or lead users to malicious content. The presence of multiple compromised CMS upload links and disposable hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de7536dd9---xitekuredutoviwuxux.pdf In PDF document text
    • http://dalaichau.com/files/48866451073.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/65553713894.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c471348033f1967a5215f43948cec1e0/39450676573.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/vaguladod.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vkk8c9snqujbu5r6ajngvsobom/xomibuturige.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/mitamozakoxedez.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/80950645451.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2k8fgn5j2dndkgkn6ttu1k7c21/30124240072.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e1e2fc5b---pegalawidak.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/gireguzufinadobe.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607001afacc9b---damin.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/vopojola.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/46dbbd0d5f0cb8ac6e4079794ef171e4/fudukorinekuxupozomaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47ed14834b---zuzenegadikoduzow.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5cd0c95bc---rizomazizet.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/dapeleremidid.pdfIn PDF document text
    • http://biomehl.com/images/content/files/vajebululivibik.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/sudowabe.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/46395149236.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2abfe9de33fc28bf88a03d0152ba7f1c/giguritowifag.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/miluzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+many+calories+in+tim+hortons+apple+fritterPDF 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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 18020 bytes
SHA-256: db91619ea8e9e06114b466636440bd5f5e11264b3cda3a02a603a831d6d723d3
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 10936 bytes
SHA-256: 6f8a99fe20b006cdf1f259322a959fa17913605629df6a07ada2e13d8c40af56

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