Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9193731818716e1…

MALICIOUS

PDF

75.7 KB Created: 2021-08-19 07:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39b1b723558d15d604cb943e5de954bd SHA-1: 3dc0a2cc9a8de8d8ced230b771d6c1ab69358cad SHA-256: d9193731818716e1a77c845b92d6e267e9bc3e5c7f5af47bd7501e8dae61c33c
184 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, suggesting it's designed to redirect users to malicious sites. The presence of a link farm on disposable hosting further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=transporte+a+trav%C3%A9s+de+la+membrana+celular+resumen PDF link annotation
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/24906603857.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/77832770213.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bd34a598679---jupajobodatuginigof.pdfPDF link annotation
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2p5e0cduurt5kre4tf2b4sn1up/11389398830.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/fobawaminuluzofawudiz.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108041642461777.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b58cff6c---25684268570.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vafuzi.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/78778027537.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/58787541483.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/womigitolopojarebidi.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/23193278745.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/47548924468.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/sigokokojowovepekexoxe.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/18563704535.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/e7vo6951qoofehgbbq7rfi9lg1/69339756326.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/mabona.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/35107a5cebdab7ba6191438e2c3a21f5/24402439295.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/63304772202.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/v3q7o0uk20ahjerk07904emro6/jidakunam.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bdca8a498---52331794852.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210728_A71CAA15878A7F69.pdfIn PDF document text
    • http://proxima-design.cz/files/file/36766649085.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_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 11004 bytes
SHA-256: 5463b159eaf46d7b69102454f4b44ef1b8a5c2f1b071f7210ecb14c96d1eac5c
font_01_sfnt_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 15384 bytes
SHA-256: acb81378347e213afc569e8b7bd240d4f6a26b96a802e1f18118f0e3667f7e73

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