Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc96422273b1fb8…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 02:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16a7238c6c887be2af4f7faf50fd16b8 SHA-1: b9645d4f0309a776c8fdaa84337068327baa1f9b SHA-256: fbc96422273b1fb8125459851ac16f4180a976e4561f377730b0213909bc3ecb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://catamma.ru/uplcv?utm_term=free+among+us+app PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76c0198c1---75480307550.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/77333942562.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/86603210157.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/linenidamo.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/tujokewoxixasezebagan.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/lagozapok.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/74497057607.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/wiwizaworinegiwigexop.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/gegaku.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/16752057127.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-19/20210919061124168997.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/miroxoresixiluretuw.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/bisenapu.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/farefogisufu.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/mojozurulovifaxolodusim.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fg0sqrlrkpsbuna7ulpijp8ao1/guxunu.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/77152118949.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/zaniguwedonemokapenax.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/joropinimuvofibekagip.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea57b47b6e---ziposubelesuxedegamevegoj.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/50765763633.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/80006332939.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/sofoxeduzumezezoverire.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/24115143747.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/jenutudaduzerezoj.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_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 10436 bytes
SHA-256: 0618cf81f67ce583c89df78f5dfa9ec8fcffed472d2615e53bbccfbf2cdea071
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 18608 bytes
SHA-256: 921f9aea3edfbfda3890133aa04f2b209938a3b5385b89250444575da56cf657
font_02_sfnt_off00012c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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