Malicious PDF — malware analysis report

Static analysis result for SHA-256 25106468d65fa35a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 12:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c638b4c3bf0e000b28ce09ddce0dde1 SHA-1: 7190c5b325459b1333be6d883d13da702b8fb15f SHA-256: 25106468d65fa35a6e5421d05e21dc15ce04ffd7502f32db4e954cf20ad33be8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting sites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tea-ra.com/user_data/upload/save_image/files/66682754786.pdf
    • http://tahi.hu/ckfinder/userfiles/files/baponukoku.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h4v3s5s2qbnh28td6f034p8bm7/vemapekatitixoboz.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/gaxibovepog.pdf
    • http://ecme.site/2015/vat/upload/files/43821499828.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ksfooa6bfhte3kper460lgos00/14917690564.pdf
    • https://clove7.com/userfiles/file/61303219490.pdf
    • http://shannonlakeestates.org/fck_images/file/62053966781.pdf
    • http://ingenermarket.ru/userfiles/kuperagadufotuwojomusob.pdf
    • http://amghanoi.com/images/ckeditor/files/topebenotepiwejexaxipu.pdf
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/penepejek.pdf
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/48176809867.pdf
    • http://abwninemile.com/uploads/files/21530522484.pdf
    • https://ghnservizi.com/file/jigopanijokoredad.pdf
    • http://speaklifeiamgreatness.com/files/files/mokukilupikobemon.pdf
    • http://xn--z92bzy85x.com/userData/board/file/63095969197.pdf
    • http://myoffice2561.sesao33.net/UserFiles/File/79963212677.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd0e8eb3ab---gajinimozadikadiloremive.pdf
    • http://eyela.kr/uploadfile/fckeditor/file/robapukeposikav.pdf
    • http://stavo-bazar.cz/userfiles/file/17378267218.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/rikuvuxasogotomu.pdf
    • https://xn--psg-9lac.hu/files/files/94793940502.pdf
    • http://oilmachineydy.com/d/files/nejixalin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+iso+image
    • 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_off0000bedc.bin
ac734fbe9b2f256db4d959ba078be7cbf0eae5a1b26952ed81487e55faab91e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDC 10428 bytes
font_01_sfnt_off0000d63c.bin
84b9e2e661c944f4acaff57d70298bd4ad72e24d4a3867e948552e1e9fbe76f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 16520 bytes
font_02_sfnt_off000100ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 16792 bytes