Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f46b317e3487dd1…

MALICIOUS

PDF

111.9 KB Created: 2021-06-10 12:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a2ea266ee9bc7ca6870dabc2555f521 SHA-1: 9c2723a74b8ed7037c86b784e01b311993a26a73 SHA-256: 1f46b317e3487dd1c7b1f16b6422fa07fa88bced3c800c406dc9e50b1274b331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=nombre+arabes+con+significado
    • http://rainbowcaterers.in/userfiles/file/sagilojalalol.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/bogiz.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091a8e404821---zodadunimali.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/10808497483.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e3bfefabe6a96dfb7e5f5fcbd28de574/43528753494.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0032ab4a1---90320747480.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/gelesizipetarizo.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/sawevud.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90208393f---bemon.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5888817bc---zazotipamufe.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/af2graoio8vfpko5cic6kv4kj7/zitujaxikuleduvudo.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160968a27d3208---72006453358.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce40d61b74---tujepewosidipazelavud.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc32491467---luxig.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f204e4cff8---45999682954.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/e2uqffpnfji06b4ed4uiinj5q7/nejuxijalamupo.pdf
    • https://dacinsara.ro/fckfiles/file/49755491986.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017133.bin
78f80ed5bfbadefab01f566067a90f962132425d9c4893f8392f5f0804230cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17133 5416 bytes
font_01_sfnt_off00018387.bin
32cb589491a65eab59359f88a60e5b203f442583db35f3e45faf7caee8abb674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18387 15216 bytes

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