Malicious PDF — malware analysis report

Static analysis result for SHA-256 c528394bd4ca5d7f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 10:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1e4734e8ae87f603255ab3cec4aeab5 SHA-1: 650b0aad94220df414a0f4f99d034a0748f4fa9a SHA-256: c528394bd4ca5d7f7e081aafaff36fc99a36ac5acece5251f8735d9bc7c74314
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94b6ba5c2---pukatewuvigevujux.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ae632077f003dd14fb7a18f69c277178/37225551672.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f9d964e4d807dc4499950297adc82cbd/gatuk.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/97740405413.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7021191a---mixit.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/xotikutuzabikupex.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/wukagagipufo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a830a8a951a---xepegetanoferezeruxu.pdfIn PDF document text
    • http://sgpeo.pl/users//file/39292294366.pdfIn PDF document text
    • https://svltv.in/userfiles/files/99315313669.pdfIn PDF document text
    • http://envigest.cz/upload/file/wexevufusi.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/44544558355.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/kabojul.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e10f0932c---76796097454.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/4265465633.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82f8b518e6---50293772249.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fece6cf797---guwetifasipepezakis.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/38211765688.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/jogamanu.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/pavonapul.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161009b5f20648---41607929443.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/zedejutikexuwazo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/80ad3a1ac64df4a1af590a88d6cfbbd1/jemasudasotiruwa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7d3b4873---josese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=text+to+bmpPDF 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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 9948 bytes
SHA-256: 53f68e71b2499802014ad5aa3b84f3b7b2df9f6afec0029ed9c027ed31923b36
font_02_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 18812 bytes
SHA-256: 84aa0f3b3fd20200695de694ea0ae635e3f7c87c9e6455d0c06b63e2abfcb42f

Open this report in the interactive analyzer, or submit your own file for analysis.