Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9eb96f84516aea8…

MALICIOUS

PDF

97.5 KB Created: 2021-09-07 00:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb42e1b24c44a9c430a60e35eeedc7cc SHA-1: affea08ecb1dc5bd5063b981cb2ad6e82c471fc0 SHA-256: a9eb96f84516aea8270558eb2acc66892fc4b8cc991af23daab402fe5b762ebd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to disposable hosting sites and a visual download button, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • 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://oniceh.ru/uplcv?utm_term=goal+seek+in+excel+2007+with+example+pdf PDF link annotation
    • http://orderleesushi.com/uploads/files/golutowijilewilozabes.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kuwagosilolofuwixid.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/buzuteg.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161137704514ab---46334170679.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b820425527---92831516636.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5b4a1224---36410902334.pdfIn PDF document text
    • http://mutitar.com/user_img/files/jasewejiwiwofuwamelerexaf.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wituxabusinozofower.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/37180173287.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/57f4bcc4rui9s2trshkse4h850/61574896509.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef4f8cee9---48294820571.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/62660350824.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b337e1cd4ae42000f150879a8f0f2bc0/naxerivuvidosirifaxu.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/vokiju.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/kejanog.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/52465119762.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44e1e3376b---karibabezebevumujifano.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/sipuxatarefuvuxo.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/lijexivij.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/318cb2802135165f7c73dcb66aaffc6f/6345271636.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/pivoka.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/vesasa.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ff336a42b678622b970b2da1d003dd9e/1911250643.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_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 19716 bytes
SHA-256: ca8071b74759b8955de4f2780eae6574dc35485005be3f344d08fada925fffff
font_01_sfnt_off000144f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D08 11396 bytes
SHA-256: 842de4ffadc59d83063286bd97af9bcea599632505a648650c49ceee5cb67c61

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