Malicious PDF — malware analysis report

Static analysis result for SHA-256 5959daabb4b0c16c…

MALICIOUS

PDF

82.4 KB Created: 2021-06-25 14:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa487a6419cda61ab3822d07bd00aed2 SHA-1: 25c37c88909e6c1c2575fc17474ad2d37cb0b3f6 SHA-256: 5959daabb4b0c16c0df94114be662f50280a330f868a5199b42235e858f5ef36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or tricking them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=duties+of+a+chairperson
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160857ae08165b---nuwewodakelibobigonexuwo.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fea7178cf64f2884ca24a1dfc42578d/56166647038.pdf
    • https://299-45.com/CKEdit/upload/files/pazezilo.pdf
    • https://botorka.ro/userfiles/file/65676935209.pdf
    • http://auburn-properties.com/userfiles/files/jomabezobutolulav.pdf
    • https://aashianarealty.com/file/36846506051.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a46f090f---butuzomipedofipetimibikok.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3806277709---80129501347.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/adu8mjolvqbp1he88p6ubr4eq6/78726493291.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076337561554---71445307548.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/65836585725.pdf
    • http://asea-admin.com/_userfiles/file/20210611060840.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa073b58cdb---xojejejuvejunifuro.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe395d8dad---86121442467.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f609a71b90---54099698661.pdf
    • https://floresdeserrezuela.com/aym_image/files/sojemalugitofiriga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a5.bin
47b64acf718168cb74b5a0d8a1840aae89cc548c569dfebd8927f29128ebfae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 16308 bytes
font_01_sfnt_off00010ccc.bin
86146dc78649970aa4b83c66ddabf782abae1cb85588005c8ad37d9112a0a3d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 10632 bytes
font_02_sfnt_off00012525.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 16792 bytes

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