Malicious PDF — malware analysis report

Static analysis result for SHA-256 375b711d02c74c39…

MALICIOUS

PDF

94.2 KB Created: 2021-08-02 18:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2aed91ed35e8e94ecbc934a0616b3eb SHA-1: f9407d98852a9f88bf5c39e25d3920c6d82b4258 SHA-256: 375b711d02c74c3936f542df59a80efa68ae7873270e265584f9ee1cb5ccd94b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the detected threat point towards a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=analysis+of+macbeth+act+1+scene+5 PDF link annotation
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/pciv1kp2uj1its96mhebldv3md/78404112197.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/512499f541e3da3d0ca687b1d6732bb1/wigove.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca49dbbb73---xaxixofafawevenex.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/66004650699.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/82511753774.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06df55a26---rulugalo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1ndppckt5gvhef5s5euth8cmm2/fogixotiguge.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/zewefoz.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/91189731574.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a248d4ae1---28832044415.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/m5ap7ob5ttgr2osepj4th3p0ej/misutifibelo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/862dd2ae70f495664ebf22247816a847/gokofamunuzebif.pdfIn PDF document text
    • http://mextro.de/upload/files/lajonijor.pdfIn PDF document text
    • http://apple888.vn/luutru/files/97943541327.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/rltfm0gm509n304gf3clc70eou/sibuxajatawuwavidopigub.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/fizofuz.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/ribedetozuvuzepokilogisan.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19b782034---93569128867.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/66057325aa9f85523ae18d59dfbb3c36/zibowexidatoserotike.pdfIn PDF document text
    • http://e-district.org/userfiles/file/1383490615.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e24c78d0d84---xisixobusafo.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/41423355837.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/savozovelifu.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/sujodojopoxukaropegex.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_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 17032 bytes
SHA-256: 4cc88e13de255d3b36ae2122cbf7a8e6a3ec56514a593e52063043aec56d6561
font_01_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 10920 bytes
SHA-256: a633d312f883c19169a94dd195ea4da935003ab1c64e495f900ff5e9601fd9d2
font_02_sfnt_off00015272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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