Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fd2c865c33a7cf…

MALICIOUS

PDF

97.0 KB Created: 2021-09-05 17:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 230b9911ec32ddfd5b100bdcec55aef1 SHA-1: e9945078654f81468cfef43e5ca7078a4639d913 SHA-256: 94fd2c865c33a7cf73924a59720639c5c2e3cb87dceff649b475ccf6c2f1d17c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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 http://candientushinko.com/images/file/fusatefulupekiwakezomiliw.pdf In PDF document text
    • https://officialbacknumber.com/editor_up/65799056871.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0687c5c735---92841584615.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/26627160245.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46e09262f---28637275654.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/povojurawodujajidobikuna.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kirakebuwo.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210524164159.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/pejulinuzazubijuto.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/7e495g0n2m92fhftk3ukkkd0rt/47358250404.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/85574048288.pdfIn PDF document text
    • http://maidichike.com/upload/files/60161647063.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/57bruujsittoqaujl1ltightu2/xukaweda.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/pikazetuf.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/88544525567.pdfIn PDF document text
    • https://superchills.com/userfiles/file/57706298855.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/91952792993.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210818224858_1277957614.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/47515586240.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/35608394684.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5fb067b4040a6cebcef5f9d675d31c16/todemaravodajujoxefikax.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/luwojojebed.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/74471375877.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70dd0b34e---dinofekazilatefofaj.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210723_105337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=anker+soundbuds+life+owners+manualPDF link annotation
    • 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_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 10816 bytes
SHA-256: c754a22d7868f956e47337c883e9353c402ab3f9d8a44fcbfbde5e526c41dde3
font_02_sfnt_off000138a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A1 23328 bytes
SHA-256: 3e82b8e39ea78729f32002fcdf32df8aa9840406126df728e21ebd8bbb8816db

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