Malicious PDF — malware analysis report

Static analysis result for SHA-256 027ac8fc75bb00ea…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 22:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5b8a154adafd7e78d47bbc1a1159f80 SHA-1: 595d5bedcaa902ffaf5eb5ce7aa642234c24e9da SHA-256: 027ac8fc75bb00eaa106eed5d6a92b25f4e734a8c76b23ead130d0e032dbcdbb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ogandp9dp3aqvtqkfn0ahsq9p4/guguwavukab.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/20295353972.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/daa5e27659a774d431009647996d0fa0/33360875327.pdf
    • https://vmwarts.com/ecovic/file/24229936716.pdf
    • http://garmaclima.com/uploads/ckfinder/files/77691245012.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d803489503---bufodafef.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/46e15aaca11b6d90f687950b1b0c6cbf/filibaridujepusosidugik.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413d06372c6---firosifegefumigufupiteped.pdf
    • https://kede.org/userfiles/file/72768453543.pdf
    • http://sushimura1.com/uploads/files/90664710359.pdf
    • http://methese.com/upload/files/34775241636.pdf
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/giwisufetuxum.pdf
    • https://linker.tw/files/14657355068.pdf
    • http://belv.ru/userfiles/file/bexodaz.pdf
    • http://kiko168.com/UploadFile/file/20210907000429496.pdf
    • http://thecargonepal.com/userfiles/file/68687825542.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/gobix.pdf
    • https://stancijanegrin.com/userfiles/file/35700072334.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97475593815.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0a73f15b6917e44b7af7261000d9fcc2/21178723379.pdf
    • https://merlak.ru/userfiles/file/21570818182.pdf
    • http://fipjp.com/userfiles/file/xakubozawepadavajuzu.pdf
    • https://technoarc.net/userfiles/file/74480203516.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700439df35---lakitexareje.pdf
    • http://happyorderfood.com/uploads/files/37105024715.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/97066193743.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=3d+hentai+game+pc
    • 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_off0000b305.bin
d139369400cf19ef5b6b211fa4525319d37fa90d4378c724886bc2083794a482
pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 10604 bytes
font_01_sfnt_off0000cacd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCACD 16792 bytes
font_02_sfnt_off0000e2df.bin
86fe5ff78970515c96001b9a157c95db7a32beec9772db1286f0a0bbcfe1c7af
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 16932 bytes