Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3767d7593b6cb8…

MALICIOUS

PDF

75.6 KB Created: 2021-06-23 12:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e6509a4166379098c329681a20b4098 SHA-1: 3e432860cb1d492e51cc839dd83b3f0a3193981c SHA-256: 9e3767d7593b6cb86da9dcbc34dd07cd66e7d98f7517d3cf653b196ab3222c6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c940c6551a---96104083175.pdf
    • https://tahubunting1.com/contents//files/86978052121.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083401c9087b.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bddf116b3db---xuxosuxeserudaxilidimusuf.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ec19e648---89588320265.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b6eca77b041142b6e0a0c65e9079fb4b/59928298339.pdf
    • http://balone.net/_upload/file/%5C/84793827366.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc73b34a43---39755654602.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/zezetavawaluzilogekanuxo.pdf
    • http://www.firengo.com/userfiles/files/99868573519.pdf
    • http://poolprotektor.com/userfiles/file/xidutajigorabuxakazajaxe.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/bddad93fd96ff24bec877fe509784f43/71570157085.pdf
    • http://libron.pl/fckupload/assets/file/folaxibuvone.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/fdkk4u44r2j45189oso67037ut/bisenudomenamituzopuguvat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mineduc+textos+escolares+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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da51.bin
74a02f060ba1669e6ac9ade660a54726467aa8f01017aa53f94122694765c334		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 5220 bytes
font_01_sfnt_off0000ec2c.bin
0c8db2db650bc9ffb6d29fe06e2959fdc042f572d0ccc18152100e0caede9925		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 3524 bytes
font_02_sfnt_off0000f957.bin
fb5ee293f07e10ca971cdbee05b58f1da2639d9ab9d3391ab7599c620279af43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 12148 bytes

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