Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c94184ed928a9ac…

MALICIOUS

PDF

107.2 KB Created: 2021-06-26 04:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f358507f04078536f66cf66721866c4b SHA-1: 5512629fa65df27eff07345ee4ca0fc60a4ada6d SHA-256: 9c94184ed928a9ac1aeb7fa3c9356d3dccf9478d46121cbb524ebc8761c41b64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, with numerous URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c662a3dfa72---60562126072.pdf
    • http://zh-huaxun.com/uploadfiles/files/16065790928.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851bd93c484---45501532546.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebae0a1573---gomirowadarugumalo.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/pivemozorovowujo.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4cc9b131---pijate.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cdec80252---wokebutubovefaju.pdf
    • http://mega.kz/media/upload/files/75375374868.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b50abc43371ae187c90a23adc5fa20e1/36995538655.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/10f30932731812b14e821bb11e654ace/73881417601.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16076aff614104---goxojijolezowagiweb.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6f282e2346c24ca1abb58a66e7a62f9b/1452573276.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1eb52d1aef370cee5227a6b25a28e9f5/xupidakokuvineralujenugi.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2aaf3e18bdca638eabcdf75c97135f08/nugabikawabewo.pdf
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/35427021901.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/p3928s1dkq01r7plk2fhudjj4g/17667480003.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd5980f5a---76334784513.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/df40a1ad8944012ad13f9f9013227b2f/febibotumumolifojoz.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hccbitbjb12tvugm0hmkdnjekf/gotevotidafedasadozijol.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e0044311392ba492b935bae17d6ab200/kepilatumojajufuwakewal.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16097e8a440cb3---jorasalevotomomup.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/40686910073.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/2168ad4049c198940034f1f61ee9e2c1/58520279506.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=all+might+all+might
    • https://mediaget.com/userfiles/files/xukagerilasadovej.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001242e.bin
943ca4e09bdcaf3fac7d28c84d12ba7ebffb5d57c34972e6663d218248f27704
pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 9912 bytes
font_01_sfnt_off000139f4.bin
3c20282e06fb98c3da221134daacd67b4862e28d63bea1e2cf763ae619b768cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x139F4 8356 bytes
font_02_sfnt_off000156c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x156C5 16792 bytes
font_03_sfnt_off00016ed7.bin
8598e47f7fd1f491852c641fcb605f5e5c09c588e2eff95429c1c7b79c7a21c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED7 19292 bytes