Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3025844d1219960…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 11:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd63e878205d17fe429dbbbd56487fa2 SHA-1: a8e220524b4e8f789d934b87b879186812e604a5 SHA-256: f3025844d1219960e7549c215503522df8efdae9dbcb04024a538fab0c9751b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/016p8clj9goektug1bb71p0nkb/tixinijanoduzudiberik.pdf In PDF document text
    • http://chowdhurytourism.com/ckfinder/userfiles/files/9128814028.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebfea77eb---lijawijabugevuxokepeluko.pdfIn PDF document text
    • http://bamila.vn/luutru/files/vaferabuwaxuvavutefelila.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/60158196820.pdfIn PDF document text
    • https://ekransamara.ru/files/9762330805.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/94184570162.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47dece19cf---wokexi.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/48830367660.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb46bb912d---53824422462.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f44a180e4---tejudufipukusepuwilud.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210613_BAD6E357C1FD9820.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/5820441992.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/ridusozuramivu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/sj1jll7fehf9c8445ctt6nc5um/jasimon.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67bf8903de---fexumepifajumazasijawu.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/diwudowedadufavas.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/xuvavimevugus.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089f70dbb4cd---81556050938.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/14428116605.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/losibipazivadepudibus.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4cc19eea---42706279774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mechanical+maintenance+supervisor+job+description+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_off0000cd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 19820 bytes
SHA-256: d6631b0ecab4de7a75dfeb67e8e40cad0ea2a09363bef377380ea3e072273c95
font_02_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 11316 bytes
SHA-256: b9b8c79a54449feb171d36b73822c5d7189ef37da43c2aed3fcc715abfc73564

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