Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21d10df982b8a4f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 22:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b6b18c26f4e91a4e88bba9ed1397101 SHA-1: b70ca675f73c2625d915b854ebefc43005b870ae SHA-256: d21d10df982b8a4f891d792fa2423e8816b820945aa1f84d7f9451bb1be43976
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 CMS uploads and using SEO poisoning tactics to appear legitimate. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm and compromised host findings are sufficient indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a894ab6f1---suvetiwifuvivoxusutaw.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a98cb731---wizenerafuxerog.pdf
    • http://allmedicus.com/userfiles/file/50192692641.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/4245ef98c7998fa7e992ca5d8b2246bf/73992032502.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b754da07---20045793810.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb4105f45---nomadipo.pdf
    • https://alakharia.com/public_html/userfiles/file/konevavikufofarudadumi.pdf
    • http://akinmedikal.com/uploads/file/35780108223.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/lukubasijejenopebepixedev.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/f1p83djjv07m603n8tapvvojrh/zetiwidoxuno.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/94e30c5120e2e95dd8c0ffe61b941665/newosekukilok.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/xerusasetakale.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/e2vvcfj8nvlqm61ep97hc2gjb9/lowawulavi.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ba80f6d6f3112290997d14794ab2be83/14863475742.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2aa880b26---6132953995.pdf
    • http://wabasnb.com/files/fckeditor/file/158558536660d2b75400962.pdf
    • http://slsnn.ru/content/file/jesuwigubalovog.pdf
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/96429912934.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce75ac5302---xomirikadawesel.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3554b12d17---nogenazedotipewe.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91307099da---mupifu.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a039cad8e---43924401438.pdf
    • http://tilestone-pools.com/i/File/13153455767.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+lose+3+inches+off+waist+in+a+week
    • 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_off0000eba7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 16792 bytes
font_01_sfnt_off000103b9.bin
a7ba226f5a41c5c09da9a1ae259df1947a15a5f0146bde9535b0f7ec4fb46096
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 17132 bytes
font_02_sfnt_off0001306b.bin
63eeb5dfb22e5f58a933f30467ba7356a0d77298da87e615d39ae3784762d1c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 10672 bytes