Malicious PDF — malware analysis report

Static analysis result for SHA-256 de39a63faa014c84…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 05:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f7c7ebe65905d630dd63926d0945808e SHA-1: cad3ca730578100ae734fa21247c41e4dc6c1fbb SHA-256: de39a63faa014c84e964aff92e0df588c29375ba0349b5eb0ed2d4a2c3b61124
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=for+your+encouragement PDF link annotation
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7861fff9d8b6ee09a1cfb3102e53b78a/20266505651.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/6970096428.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/mibokomifosiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f44dd8891ff---weputatidavodukikofotes.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1cadf3132---jofuzudanojija.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/97702952383.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/fidow.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/8174049705.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/galofupibiruxixegebabebe.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/pajiwaros.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/94249280693.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/damejupufamegupe.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/tuvego.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/89138203364.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607decb86bd52---puwavejitofode.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/80u25or3qs014sj8rru3fdag71/dobotolete.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fd5b8c40c823af3630c4edc840e7ca2b/18318887320.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/duwobulosubobiwet.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b2f174da826cf78a1454bde46b369455/33316116301.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/fowunuvedivaxetosal.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/regadetamunajo.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/96401981411.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3c5b42bd613330d9ec5b2dc09110fee5/22921458354.pdfIn PDF document text
    • https://giustofiori.it/file/32669743342.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/92185913566.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a205bc8fd6d---71180816628.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/57d9393a11011f0d7323beeeb1d90ce7/zabusivupotowipenimenax.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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 18688 bytes
SHA-256: 27f9c46aa0243bbcac1683d9d84bb11c126e619abc17eda4e25513e349160210
font_01_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 10460 bytes
SHA-256: 2ca3344e5067c106abe413efe74530c11d681a0b33a4ef061a9de19532854ebd
font_02_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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