Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f863382d42c9de…

MALICIOUS

PDF

93.2 KB Created: 2021-08-06 08:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8b3a7af1c4bd7b0166034ee9e65771ff SHA-1: 1e11988adc57e9c2414048666a54ed009462f9dd SHA-256: e8f863382d42c9de587b15749fed5a2f919e85cf0a56f7ca229e89d8b6282809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the PDF is intended to redirect users to malicious sites, likely for downloading further payloads or engaging in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=download+vmware+workstation+14+full+crack PDF link annotation
    • https://naucharts.com/ckfinder/userfiles/files/62522854519.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bcf28668b70d047264232f4458ef02b4/futedivatojisixofotovoxa.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/sisofowifobilizubow.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda5395e0c---fobubatofixikadadisorixid.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210607_B43A7CAD04155CE5.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210620/file/63626333615.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/11749663139.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790636a7595---zanem.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/dosaxifobugebil.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/45ba1ca9689b1df965b04fec83e3c7bf/84468969366.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/90516715088.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/72f9637d9006ff0b99c9cc51ff4ea7b9/93022041137.pdfIn PDF document text
    • http://nenorm.com/files/files/2962745115.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076f638f008c---73180700966.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/tomobovozukujibo.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/25264218238.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/67477250076.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/makazirozivajodilanuv.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/37863112631.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703f477c901---19359670409.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e84051b19---sufatitebapog.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/34513222224.pdfIn PDF document text
    • https://kawanmto.net/contents//files/69884791567.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/87844165187.pdfIn PDF document text
    • https://c��ngngh���360.vn/category/reviewIn PDF document text
    • https://c��ngngh���360.vnIn 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_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 11112 bytes
SHA-256: 53b4ad807ee14c4bf331ab3252ac8e506ce199e4f9950d2b73c42e14da0d4df6
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 30788 bytes
SHA-256: df6a7df243249a55079056dc74b8f6dbc5d43029c6ba636c481a9240c73e24fc

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