Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b3fe336ad89f6c…

MALICIOUS

PDF

75.7 KB Created: 2021-07-01 19:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b976efeca1e33aeefb59f42b003bef1 SHA-1: e65b47eb43f4105ba7c4654c5cb26da8f1c0328d SHA-256: 40b3fe336ad89f6cb02f0fefb87d7c030239f1223087fcae3958afc05485f4e5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the presence of embedded links, with several pointing to compromised CMS upload directories and one directly to an IP address, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and embedded links strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/77194437816dbd1d6d34b6c1d4949ade/furawogizigazatupafi.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/gewiwon.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/12816876252.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/buzakunekejowe.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/42625388339.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/34903091160.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee39348c98---pagijekikadokebovidike.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1778de1a36---xexopobevosex.pdfPDF link annotation
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/jep0go6i4v93tn7rkce4vbane0/nexidikupativikiked.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a88eb148a1e---rofisisibirobikagu.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18430175098.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acb3734a8eb---dewokofi.pdfIn PDF document text
    • http://hydrem.ru/images/file/zitiwasuruxisekutivigibit.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3ad7fbbd14b639d8f12888120e2ce3ce/jubopope.pdfIn PDF document text
    • http://nova-auto.com/upload/66213804592.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26e8e6a74e---4116443225.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/75982199966.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1ui5sicbuca0s13595squvqbn2/34741089242.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/xajokofujevewuwepa.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/49001381903.pdfIn PDF document text
    • http://jarosi.hu/files/file/12426726815.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/isa4l76bqd3ohivth25dkrcjj5/bojubezife.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/megotuzisagibugikukasib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=johnson+branch+state+parkPDF link annotation
    • http://medlab.webd.pl/upload/file/vuretevasaza.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 17168 bytes
SHA-256: 45e37cdfeabd665c54aa24ca5fb7f82bafca75c754385ae4e3c2bf00da6bff7e
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 10556 bytes
SHA-256: c96a3deb96474545e1340ead0125db272b8a67be43ef036bdad4b15085bafd8d

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