Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ad4d6f74b4651f…

MALICIOUS

PDF

87.7 KB Created: 2021-07-08 11:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5736060993834b9d903cfe1c78f3893 SHA-1: ddebeeead63cfba6b62e3dcd71c3f376b3bbba0d SHA-256: d6ad4d6f74b4651f1333cded5ca52c346b8882ab805a38b8d7741226c9b53607
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The file also functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://suankaew.net/upload/userfile/files/jojufep.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210610_015205_5895.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f69401242---93010675252.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff97bad9a3---fovagiwi.pdf
    • http://www.findvoters.com/userfiles/file/67749595110.pdf
    • http://magogaralbamoble.com/galeria/files/kexipowusezuzibulore.pdf
    • http://nwatchonline.net/userfiles/file/40972145503.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079004c83438---29111098123.pdf
    • https://alianzatours.com/imagenes/file/74519562718.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b82a8677d---96015843932.pdf
    • http://artgraf24.pl/userfiles/file/dazuwozerawifenajuwip.pdf
    • http://sincaremedicaltour.com/js/upload/89244223378.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/72720843796.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/vilolizulatopetefaw.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/d1d152d27e6c119eca951fe417b10b77/48518811604.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/npivfethc2e85rllk3q4dsennf/22784319095.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160945f754dfb2---32469675362.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/xabeze.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2a67eec861c68c70c4ea514af7337d0f/siwetuwiju.pdf
    • http://dailymaydemtien.com/userfiles/files/nisuwutosusawetagu.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607838691b504---59024334820.pdf
    • https://hondamienbac.vn/userfiles/file/94721406099.pdf
    • http://iwilldoit.ru/uploads/files/files/7440863238.pdf
    • https://himalayanthailand.com/image/upload/File/dugamidobejix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+many+tenses+in+english+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e1.bin
6aec6d96ef59d965a862146888b3b280dae31dc3241f8d0e23aec05bd5dd2621
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 11036 bytes
font_01_sfnt_off00010c2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 16792 bytes
font_02_sfnt_off00012441.bin
e18cbd600164fe28e99d729e638c87b999696a464f8cb20239167bae59ac7fce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 17320 bytes