Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e4257f849a105e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 21:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c46fb7eec812d28a4bdd4ed01547663 SHA-1: a9214495aee90b190612f15aedf4d84f459fb862 SHA-256: d5e4257f849a105e3d07feed975fbf3d6276103310d621c9dd59ba6aa5c6b5a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs lead to compromised WordPress upload directories or are hosted on disposable domains, suggesting an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=can+i+retrieve+deleted+texts+from+my+android PDF link annotation
    • http://emekyesiltepe.net/images_upload/files/xesikujuzupaseputet.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/93487236046.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/34625035261.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/4623865712.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/lurupabu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b22453c666---buketab.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/85240936312.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/zujadusalozowumigoso.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138faef586f0---82724813082.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/33878b943cbc446d07c57866dc10995a/82176478537.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/najomu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/vuwiputaf.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/kudufoxefoja.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/nisukevabunexezuvogis.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/kefewekatovezu.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/45049568956.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/97578000999.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/76253909799.pdfIn PDF document text
    • http://minhanh.com/files/78548254442.pdfIn PDF document text
    • 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_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 19384 bytes
SHA-256: 560980d01a549a4706c58e61beb0a46b1bde5a261d78132ad7b59cddaf82ce6d
font_02_sfnt_off000125ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CE 10828 bytes
SHA-256: c570dd0d692f329cca322192579589998a9daa8320c0ee7f4ae038fb9ebf9ad6