PDF malware analysis — malicious · e5650d9e0eec8d5e

MALICIOUS

PDF

93.1 KB Created: 2021-08-13 00:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: f04d7af7cb801d6e6ceb8851edf2d063 SHA-1: 42c29c4c9dc6d1503bdcd3c45c1cbca806799577 SHA-256: e5650d9e0eec8d5e978a9ffe5ec9090821d8f92732d3018fd35da8039c347e0d

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL analysis strongly indicate a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://coretry.ru/uplcv?utm_term=how+to+make+amiibo+without+nfc+tags PDF link annotation
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab079c974ad---26716382433.pdfIn PDF document text
- http://baloneacessorios.com/_upload/file///ronatawalowemikikapude.pdfIn PDF document text
- https://umartravel.com/files/87625075315.pdfIn PDF document text
- https://alves.bg/ckfinder/userfiles/files/gazinunedorisatebi.pdfIn PDF document text
- http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40334b50a5---nubanobu.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc04901e5---vivovozegevubigibofuj.pdfIn PDF document text
- http://choinka4x4.org/cms/files/file/1685225661.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bd56t1hv0s0uciu1utsak3gvt4/92634041474.pdfIn PDF document text
- http://suamayin.biz/userfiles/file/pijonidozi.pdfIn PDF document text
- https://manuscripthandler.com/userfiles/file/nisawavuxinisedemovebabe.pdfIn PDF document text
- http://mamtomchabahai.com/uploads/files/files/zubawopona.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce155a540b1---jodesopuguxukikiror.pdfIn PDF document text
- http://mygiftltd.com/userfiles/file/gonuvagaja.pdfIn PDF document text
- http://fantalife.nl/userfiles/file/42896496136.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af58ee595ee---8838906254.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-5-20/20210520014245470931.pdfIn PDF document text
- http://mppscstudy.com/admin/usercontent/file/5296692123.pdfIn PDF document text
- http://fixafilm.se/userfiles/file/91411554273.pdfIn PDF document text
- http://archgeo-leszno.pl/uploads/userfiles/files/13093813264.pdfIn PDF document text
- http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c235b330ca---19038635585.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a69eb34b2ad---baturelesimojuxev.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/55cni1job3r12i6l8n4fu0uh8i/xarilukapiwubarepoxabe.pdfIn PDF document text
- http://waypl.pl/upload/File/25503338508.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160811d8915f00---bawamipum.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f170.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF170	11044 bytes
SHA-256: `1c497bbcb4e02af56e8855dacdf554d88355edd6936884dfcf42f4e255bd3a3b`
`font_01_sfnt_off00010b04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B04	16900 bytes
SHA-256: `e2eb40979232a582ebb37a8932bb562b0f67da0e765a6239d92c8a1ed3e3aa9a`
`font_02_sfnt_off000136c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136C2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00014ed3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14ED3	16344 bytes
SHA-256: `5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58`

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