Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a920b46575c005b…

MALICIOUS

PDF

69.5 KB Created: 2021-05-15 12:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27cd6d58fccd19b4e3d935ac397e7cd1 SHA-1: 6b625879b68a51c3f28077595527c3cbbf6f5556 SHA-256: 2a920b46575c005b52d7f70d77b0673c719aeac02a5d608aaa75d6e1cb93bdf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It utilizes a link farm hosted on compromised WordPress sites, presenting a fake 'Pradhan mantri awas yojana housing loan form' to deceive users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through social engineering and deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9589

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16081315cdf41d---15961045173.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/12a6d020e0c3614d1bb903fa991e9732/logiponi.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160741b0d4d1a3---bazutov.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9d962ef1---50881570836.pdf
    • https://pharma-tools.eu/galeria/file/posil.pdf
    • https://securityguardsupply.org/php/uploads/file/dipakujudatomujol.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e41239b4---38843646405.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac5c71821---pafunazepukaku.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e7db0d804da8f839d5a679b5792253b3/wutefozenanixuvobikemubo.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eefc5b8191---zexotumefofilezodir.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714187b2117---48330350241.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d02a9d43---9825536687.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/tp3517f129etjq83359aqkb442/sizen.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cab36ca4f---4156968905.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pradhan+mantri+awas+yojana+housing+loan+form
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7a.bin
be754a14f46a671572ac95cd068299c3f8327aaaca58b7d0e2cdf906a5a63c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 5592 bytes
font_01_sfnt_off0000ed6e.bin
bcd33327ff500b1e78b905687eb2379d877d3d5bcd03673d496865021120c6e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 10944 bytes

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