Malicious PDF — malware analysis report

Static analysis result for SHA-256 1125d1877c4b98cc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 09:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62808467fca3ba4057148632b345a927 SHA-1: 23a353233882d0761ca04f2184639eac29b32095 SHA-256: 1125d1877c4b98cc5813ffd456bdee218edc5b8c8268ebf604799b3da2d4dcc1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for a phishing trojan and an ML classifier indicating high maliciousness. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a compromised or malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mskgroup-spb.ru/upload/file/kakijusogevilovumu.pdf In PDF document text
    • http://ats-dz.com/userfiles/file/wubudaxevesiwofofevoxif.pdfIn PDF document text
    • http://esistore.com/userfiles/file/14588584874.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/79mvilqlb2n8gkgrlanida5tu5/solokimomudidewirotov.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/luvikikedisubazoleb.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf80570abc---17664347742.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5cb67c625---35040214391.pdfIn PDF document text
    • https://papiratisk.cz/soubory/35977083824.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613551f980279---mipadefezukofatuxoditep.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/newen.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3191866a6b7b524d14c3953b148cd0e8/74075170836.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/pudejiwojize.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/36789565331.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec8ea857c---ribukemisurod.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/73249810185.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/38372315789.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161177c7b3666c---xejakumamofe.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/83351770358.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/mukewopo.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/radozonimolekesemipazajam.pdfIn PDF document text
    • https://rajakedua.com/contents//files/pikomexe.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61397ecd83---saxabunizubugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=descargar+libro+pantalones+cortos+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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 10936 bytes
SHA-256: 5635598deb5aaba1d2b3fae101e1737928ef86006d91498fc915849879fc68ca
font_02_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 20592 bytes
SHA-256: 4ce639502c0221e93d9afee5c01f55b40737ca8f11f070f9495c5431e224e656

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