Malicious PDF — malware analysis report

Static analysis result for SHA-256 5936565ca1a85e08…

MALICIOUS

PDF

70.3 KB Created: 2021-09-20 02:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9190ed3a0c51bbf42d4d7d8fb9a35016 SHA-1: 50a75c6bf6f5e6a7a06343085c74a7b1943c467e SHA-256: 5936565ca1a85e081997cc64dba1f467a7bbd90b9339737fb7423fd7fa143867
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://medvor.ru/uplcv?utm_term=how+to+delete+factory+apps+on+android+without+rooting PDF link annotation
    • http://ensky-chemical.com/upload/files/janofutuveremow.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e29f419a5---91620075827.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/56160233728.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/63155449621.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/zewejorapakavekupuravulu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/89604216497.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/rojigaju.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/50027162434.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/78345562300.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/junuramefawidatulel.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/62040698968.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/xakatajolewikadaj.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/23464453693.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/xululeramoxofigezad.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/wowebidotipazufibusejegew.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d337a32108---40203711634.pdfIn PDF document text
    • http://grabnerestriche.at/37624848357.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161380bb01f9f2---tijozep.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/32274553661.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/010728483385.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/32120582259.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021918223567582.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/73093786672.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/sigukax.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/jonuniwuvi.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/xorivifiwebesarimurubi.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_off0000b3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CA 14760 bytes
SHA-256: 6699c1aa7ea2846481810bf05520181402655187cdc9e9b6b543358c08c9bd8f
font_01_sfnt_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 11188 bytes
SHA-256: 66716a0ddbf864b8494b001a9058db057d5d38de0f7fefeae1a7f1a38e99d7cb

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