Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acfec2c307774e8…

MALICIOUS

PDF

75.7 KB Created: 2021-07-14 08:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9415ed7a3c363a90606a6c7b3e232b6c SHA-1: 040ef0242df5f7478538f64ee4b2f7eef298bf37 SHA-256: 7acfec2c307774e8ddb7319fed926ba193780739075c756925e335230d584729
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content through these links. The presence of multiple compromised CMS upload links and link farms suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/noputijoxakulot.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6279d861e---suramutupezekobolewuv.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0060ca2b---pavemonudi.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5675cd2fd---dexidesamulumedu.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078e0e0cec90---bovusowo.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fc35c8364b10b6a336d419181db911e0/71589905093.pdf
    • http://midel.me/userfiles/file/fesugunaf.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf5708ff4c---93413869716.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/7c59e99642e6e8d5474ebd0d7ce5a721/getirasutamobagige.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a64ca397---musidizibizofapebukidubo.pdf
    • https://edusfera.pl/upload/file/marosumefewuwe.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/57455428719.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5b34a4bff---74545009897.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074922f9727b---wamode.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084066e9a83b---dalatodepozurogidasisam.pdf
    • http://bajajsports.com/userfiles/file/30490864519.pdf
    • http://szakkepzosiklos.hu/upload/file/luvoporuposoxasikano.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907fee1bb9a---23948169570.pdf
    • http://hysansam.com/fckeditor/userfiles/image/jebimidupawesux.pdf
    • http://conelser.hu/fck_uploads/file/zojiwu.pdf
    • https://orangerun.re/photo/files/faxejexotezelebav.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fd679fdf---wadupuratodupira.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174b4ac103---nidobevu.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb753dcfc2bab2f25ae9ef2c44e1b62e/jugojawekukidetefasoroj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=reporting+commands+and+requests+exercises
    • 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_off0000c495.bin
5fb7c0db67e9e2a746e2cfaac3e386e89e09dc67c6c8988d1596def873d6bc94
pdf-font-stream PDF embedded font (sfnt) at offset 0xC495 11204 bytes
font_01_sfnt_off0000de51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 16792 bytes
font_02_sfnt_off0000f663.bin
ad97a22839bbb0a1da5465b09dce10c1693fb2663ee67e50085f3d0fa96585ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 16516 bytes