Malicious PDF — malware analysis report

Static analysis result for SHA-256 9319bd6b8841c00e…

MALICIOUS

PDF

93.8 KB Created: 2021-09-02 09:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 586140de7d9a569589c6477e62c2bd65 SHA-1: db5747955194ee9416288a3931df632853364113 SHA-256: 9319bd6b8841c00e6ad7f2397bc6003f350bb788acb43cc4329ff7d0bdd9a358
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads or disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file's purpose appears to be to lure users into clicking on these links, which likely lead to phishing sites or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://adance0112.com/upfile/editor/file/64617347333.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e3vnhhavbhr3gopt6co4g0oe72/5150028014.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3db5c8acc569861fb2bc450329adb67d/wixemexijimimewalugibixaf.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608401213b0f8---dokazeg.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/90588d178131dc3d55661eab3efd2427/493558277.pdf
    • https://anakmeong.com/contents/files/fudomexuxiloremij.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a2bad261d9d---11128848656.pdf
    • http://thankschicken.com/uploads/files/gojusufusaperuga.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088c34e5eddd---wagajodudanexivomeseto.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/6bu5sn5g17pkmltrumepotg5o6/89863870270.pdf
    • http://aristosaigonhotel.com/uploads/files/fasisixowumifedipe.pdf
    • http://autosoftware.company/autoresponders_images/files/xitoxofozitoliva.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d753670bad8994dfe15a32af6032a1a2/16233281678.pdf
    • http://hotdeals24x7.com/ci/userfiles/files/30381525466.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e6a6fa26---90388326170.pdf
    • https://zionapostolicministries.org/uploads/files/lowufakeximutiwikixevonu.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1982367c2675d653c3de546e3a901c57/59548620480.pdf
    • http://bhs1966maui.com/clients/64750/File/15510427338.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/33c52f5a206c86c9a165d2d58a1b7abd/funuwulu.pdf
    • https://migger.dk/userimages/file/lozoxekutiwomututusenuliw.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/116b8509740b94215a1ef39a1bb9bfa1/xafitovoxakaketonasosu.pdf
    • http://marymo.ru/uploads/files/29441145068.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e2869a880---wixotofinixerurikizupu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=unity+in+diversity+points
    • 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_off00010baf.bin
68032112cd0b8859c82fd4dc7b7204550214879fd7fae4d021b737f297f74ca6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 10364 bytes
font_01_sfnt_off00012336.bin
22490778e14dec37e5e8c71128df88f13f84bc06a9c523e55adb1bc4dd8d9f95
pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 17588 bytes
font_02_sfnt_off000150dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x150DC 16792 bytes