Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8863d983ebba76…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 07:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e942c8343ad7751b128ea3dcadc46d1d SHA-1: 1cbf297c615621fdfa88f7fe5704b2069235c7ae SHA-256: 5d8863d983ebba76ade73f2ff76baac863d303cf0dfcaf2c8e24231619fff03b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://oniceh.ru/uplcv?utm_term=diathermy+in+surgery+pdf PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e65c7600a177725c3c30f3754f06c81e/59998149058.pdfIn PDF document text
    • http://614move.com/clients/4890/File/65669162645.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/60976543045.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/6f1d844748c47f640e48a76eb4bea718/37835658516.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c41a7e018a79c2102cc47ae8fab85692/77409252466.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160df69e07015f---34359929845.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102ca13ce1---xudopimexesulabasirigerit.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/bejefi.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/merifikuwom.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16121767937c0c---51255127439.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b7c04782---vorojubosuvitogavuta.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/seravevoxunap.pdfIn PDF document text
    • https://luminex.pl/upload/file/ruwokeviruwewazugavan.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ci31o43jk408hgm1q6fl89vaq4/87009520685.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/tevivijewapu.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/53083552123.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa4355f7b---baxilasopebakusogasisi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb75257fb77---wesalatejoxixezanotetepu.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/28015430226.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/jobukizafoludolovote.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/15758370182.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/81362956878.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061907424622.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/97500890387.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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 10996 bytes
SHA-256: cd262a5e24bc643d6d85db2a6ba1955aac8f30b7e36b334d89c0e9e2f3db918e
font_02_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16004 bytes
SHA-256: 3029a99547a647228b85dc35cb998e58c81ec6469aad57f86ea2f985e242fed2

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