Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2060bbcd1e30dd0…

MALICIOUS

PDF

72.8 KB Created: 2021-09-21 05:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15f919473b1abe1ba6ecb7a5e34ced24 SHA-1: b69327701e2f82b912f86b44094bb897b04a1a0c SHA-256: c2060bbcd1e30dd067b13c8f7c5a530d3d805db4800d3129b1b1d831f69f915e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains embedded JavaScript and a large number of links pointing to disposable domains, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute further malware. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=oreo+tv+apk+pc PDF link annotation
    • https://thehouseconcert.com/ckfinder/userfiles/files/92837330162.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210910132324.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/56061073511.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614213745a6e0---dijivowukovul.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/58658864428.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161305501df658---kumanigopilob.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/dinonuzanoxebibetonego.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/36635629271.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/68812790992.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/busotit.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480ebb10ec9---1888393725.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/56853037440.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/latew.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/67002436427.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/lowosudemukowip.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905120505_axv9cu.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/86580489405.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210919153340.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/75615244075.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/kefamidinele.pdfIn PDF document text
    • https://doitoutdoorz.com/file/ZUtDh5R3no3yv5TF.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfb51f524---771553590.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b84a885e4945da30796ecfb94a5fa37f/vibadug.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/gifakolonotip.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_off0000bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC6 10140 bytes
SHA-256: e3026d9848d78c01101b35468e50a678d141a0cafb65461db9e99e67d14803e7
font_01_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 16656 bytes
SHA-256: 2af32315078df17b0c2bcc96c9a0235ca3db4b05258e6b7cd7a3bc256fff4873

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