Malicious PDF — malware analysis report

Static analysis result for SHA-256 48926c6626d8ae26…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 21:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afc90a5f4492e93589ab1b9bb91c6ee6 SHA-1: 3a29be38cdf349aed412394a08991f9dcd65f067 SHA-256: 48926c6626d8ae26200ec422d5df13db0f2874a07ca5f551cdddbceb361abd15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The primary function appears to be redirecting users to external sites, likely for malicious purposes such as credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=e2b+dictionary+download+for+android PDF link annotation
    • https://impulsa.mantareys.net/uploads/plantillas/files/kejununufebejebitu.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/41197605884.pdfIn PDF document text
    • http://rs-entp.com/upload/file/wajegepofi.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/nukutaboxugat.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/firuv.pdfIn PDF document text
    • http://metallpress.info/files/76311238976.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8a0e14fbbf9e5c944aca7335f5dd50a0/13515757075.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/notusemiselaroxig.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109121917055158.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/2668907615.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/68856115845.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/wogiweferuzuridumeboxaxu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c05868fd8---tajenogowizegif.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/02f53df39e6ff09c0836c464300c563b/sabitoxudosisuzuxore.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/95667484316.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/likegukuwazifo.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/53043667295.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/zitelawaz.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/poponomofowipifijota.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vemiriwusulupoteru.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315711408e8---40432257682.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/kasevimuvunomuworemonizim.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_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 18460 bytes
SHA-256: 8d6e6307e9f52401d98aa0cf3beb6c6af07af35968ea95e96530ed50ceac6819
font_01_sfnt_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 10612 bytes
SHA-256: e6adbab633a7a6a724921c94b223b0a753c0e79675134bcdd13f43de1feffd5b
font_02_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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