Malicious PDF — malware analysis report

Static analysis result for SHA-256 deea02990f811e6a…

MALICIOUS

PDF

85.3 KB Created: 2021-10-05 00:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31ae320b9ec4c91f729fae6ae12d48ae SHA-1: f58b4720d058dac58bf6000e05fabdd9d2950ef3 SHA-256: deea02990f811e6a94ffcbd27b36f70b57e173d89645578a90d43ebd02665f1c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tacchigroup.com/public/thread/risorse/file/puxadesevowi.pdf In PDF document text
    • http://agppi99.pretty-match.com/upload/files/230901821.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/nopagepo.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/pufur.pdfIn PDF document text
    • https://highrise.pl/file/kofivibove.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raxudidolatirof.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/35332885707.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/tuzimida.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/nikek.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d6b0b48e7c566ed20af6fdcc2a64faa0/kevufo.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/fukuza.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/bepexosa.pdfIn PDF document text
    • http://berbun.com/user_img/file/43193964620.pdfIn PDF document text
    • https://swiz.eu/files/editor/42197030649.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qgqj2e5b2j5kfgkdp058so3cf2/xolofeberejoroporixib.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/39943209118.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/79319326208.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/7779008648.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/ruvupevupivijuz.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/95276765602.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/24416189736.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vofalegijozuno.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/be9d72a0d655e89cef3fa724d46c82d7/32507096815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=one+crazy+summer+questions+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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 18696 bytes
SHA-256: 9de0ce21aaad8844a5f0008890274581729400ca8e52c3cc960a798f6e48f182
font_02_sfnt_off00012d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 11180 bytes
SHA-256: 5e91976f9e4b0efb80f2e1caa449c9f6685d80c9d7a62999add294b9acbd02a6