Malicious PDF — malware analysis report

Static analysis result for SHA-256 5025be6327365d66…

MALICIOUS

PDF

84.9 KB Created: 2021-08-03 09:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a025b0ceee79877f0fa2f3ad98a6ded SHA-1: b23a19d0973ef1a25d7f29d58cc4a444e66ee7b2 SHA-256: 5025be6327365d664bfc76d214daef48e383e1feba603ad30ae1eeecb907db27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or potentially disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kath-kiga-bw.de/bilder/berichte/file/35963600131.pdf In PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/115ad2dd7851fabbc4b561af6a5eb9de/ruvogevewiditigev.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/wujasixoroxixifevug.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/85835915437.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/53510288718.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/98243930820.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3163bc84---gixazozuwajiwe.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/27951949322.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/65104055137.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/ruraverajudemake.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d417cd0cd3fe4a9a0a7f3c20441c29fb/3270713676.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/sirigi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a601ecd4a8b---pufikivosofif.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5cae122161bbaa701d05cea07d284896/42451717951.pdfIn PDF document text
    • http://riversedgefm.com/files/file/54320018773.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/jemovamemisekumuvebilibu.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/lixadimufadabafegemikizu.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/21445866183.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/45752277279.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/paxevimofalisilanamerosi.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a134cc74df---tevosozup.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210717_656ADDB78FF6ABD9.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ca683a4559633eeefebf2f43c1e8b84b/jaxogivevomerol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cursive+writing+worksheets+year+1PDF link annotation
    • 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_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 10880 bytes
SHA-256: 6898247b1865f157d63a4915c4e7c55346acafd49b25e8a42b2c82e387e6c47b
font_02_sfnt_off00011772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 16908 bytes
SHA-256: 268aea9a5e2bdd863a2af561b6aea230f1f0f60e973e744b630ef0afe0101595