Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c85dddb74fd9d84…

MALICIOUS

PDF

88.2 KB Created: 2021-09-09 09:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5b478b1d05769d9dd7d1d6fcfba7a79 SHA-1: bf980d945a0bb24646ae3a3f4a84d5abc8c6f41c SHA-256: 6c85dddb74fd9d84d69d60b821966f360dbb8501a9e88227cfff433184b4e8fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://garglob.ru/uplcv?utm_term=prince+of+persia+1989+download+for+android PDF link annotation
    • https://petala.gr/userfiles/file/6876339353.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613999c2a7a54---kotanasite.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/50907677804.pdfIn PDF document text
    • http://santeh.md/img/files/7837571370.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/lenitowovopam.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/podevogixivaju.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/86921267741.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/53726893428.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/sofekovejid.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/k0v8k4osdo1d9e3epdth4e7i0g/16349124115.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/9103860625.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/38197279929.pdfIn PDF document text
    • https://12shio3.com/contents/files/wiruzoxum.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e570b128a---sugud.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/8276842360.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/soravuroxumadiw.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/lezujopa.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/relutotexosamujoweru.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/galek.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eee977f04---10014486007.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/65675419865.pdfIn PDF document text
    • https://remini.hu/userfiles/file/30877330065.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/85669954395.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 11028 bytes
SHA-256: dd19397cd7fd9b33c8ced0ea30552ea5112334d4475043b20c0d151de788e6c7
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
font_03_sfnt_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 20920 bytes
SHA-256: 78a865f90ee452510a24463425df1927dd33ecbdb2a98b44d17e3302ff28f693

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