Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99eccfc8d8cd7dd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 15:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c93e16f381e5b19ec3b7696b44b3070 SHA-1: a77ad1d993353de44b6fee5e4afa136f22f1194b SHA-256: f99eccfc8d8cd7dda76d8508ac6b5ab79eb95a6c28281860be34e941131d428b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

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://pixomot.ru/uplcv?utm_term=kirby+mirror+rom PDF link annotation
    • http://nagymester.com/userfiles/file/80708032650.pdfIn PDF document text
    • http://nileagriculturalindustries.com/file/3020880192.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/53180617400.pdfIn PDF document text
    • http://katachizu.com/img/news/files/91507096967.pdfIn PDF document text
    • https://dhesient.com/media/xupikofefiv.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/dadifijafinokig.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/64913510350.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8e616e2dcad9da2652485e3749292c1c/tukolebazijuk.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109040001305471.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-7/20210907010747115797.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/dutajanogorosulidafosefe.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/5214061473.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/zeforopogirudokove.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378edf67efe---4279890725.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dmng367vofd7vj8qmjqnr7k79d/33935243568.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/55996277699.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/jumafafifafajagubutuk.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f725d8d0---3246365517.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jimuvivuravajatimed.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e40e3bb5464f08d47a8ed226f9e81dc3/biwopivotazosiziwa.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/kudivowuxak.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/70841002961.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/ginufuxiz.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/gajujopukagunadofuvaf.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_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 19284 bytes
SHA-256: 4354b7fa7bafffcc94ad7625618e1d0961c32a8c7ba3efb93e5bc5bdafd8c3f8
font_01_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 9804 bytes
SHA-256: 266787e89d832223020a8e3c99a329b345286d4388e700f04ece36912643f274
font_02_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1