Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4be12a23433dcfe…

MALICIOUS

PDF

82.3 KB Created: 2021-07-21 21:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b78a3a22e46bd57281ea73beec39222 SHA-1: 3752f56c1dff7afda53134972a9064f2b25f7e1d SHA-256: b4be12a23433dcfe8de410b81d88423f3aec3db25b2f9ae5e4dcee57c54c2a02
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL targets point to a common tactic of using compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912f6d2069---bovetevo.pdf In PDF document text
    • http://suacona.com/clients/16856/File/jogawakejinuvavajabeziw.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f62346586b---77916129279.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089595acd899---99160671591.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/99247144177.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/wiwevudabobefaxomofanej.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/5096969891.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/19573782026.pdfIn PDF document text
    • http://iltorg.ru/upload/file/fixogiwoxedud.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/2h7bfgbucrk5td12ja1r2bk7t3/sasenul.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vboffphpash9qa8u2rktid5q6i/56946398621.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/96142140374.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vui22hutmbfhmkrt2sjfvb3p9t/mizurulamalizusizeriwo.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead86d5dd5---55770743408.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4rvdfhlrtpdufi11p0gol653gj/71684652464.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/loxaxijumatamogumumux.pdfIn PDF document text
    • http://cycling-software.com/files/file/dowat.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/86678491349.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/9283299534.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a9ac13b66df79819ccf7f0381c6669c9/83265347893.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/40271269506.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/87315171859.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4c2bdbea---45821169617.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/47244416732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=property+management+jobs+near+mePDF link annotation
    • 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_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 10844 bytes
SHA-256: 93c64437bdc04414fcd19ebeb63a4fde264bc749b43c5fb1eaf51460cb3db6ec
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 17624 bytes
SHA-256: f9403a9e0d4d70f7f9e7eaf77959cc2e2b1135381f02e2ac9a7e19ba907318e5

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