PDF malware analysis — malicious · c16eec58a5a05cf5

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 15:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b49822ad11d94aee881de9ad352e1036 SHA-1: 4a076b44606c2b61962877d12a1f01c868af47da SHA-256: c16eec58a5a05cf53399cd09c5affcd424f3350f6834e1ecbecca9a8f049403a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure suggests the PDF's primary purpose is to host and distribute links to malicious or phishing content, aligning with spearphishing attachment tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9844

Heuristics 5

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://siltri.com/fck_upload/file/xubakinoxomezufekix.pdf In PDF document text
- http://caythuocdangian.net/images/files/gezil.pdfIn PDF document text
- http://liyangah.com/Upload/file/saruxofikakomusoxe.pdfIn PDF document text
- http://metrocars.london/survey/userfiles/files/96995554543.pdfIn PDF document text
- http://ubestsports.com/imager/files/20210723003346.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784c9d9a51a---44627378700.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/hh4tufpbqosg948e75srg08qdl/12152425604.pdfIn PDF document text
- http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/reguemv8pvt0lbr11svugbmsjd/12791008083.pdfIn PDF document text
- https://tahubunting1.com/contents/files/mekubomezadejebusoluwo.pdfIn PDF document text
- https://mbamantra.com/ci/userfiles/files/1193834187.pdfIn PDF document text
- http://ajivikafinance.com/userfiles/file/zovodipalobujotoxafak.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798ed6d8f7b---ronul.pdfIn PDF document text
- http://artospace.com/pics/file/74195573994.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160900cae2f7f9---xavevurozijibosas.pdfIn PDF document text
- https://rajatotogroup4.com/contents/files/runaxefa.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/xuvaluvixobegubutijuvis.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fad75cb00---sawivujavosutelelipasewe.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9f062ac9d---geteze.pdfIn PDF document text
- http://weberstellen.ch/userfiles/file/15209181026.pdfIn PDF document text
- http://bezagsecurity.cz/userfiles/jafodebukulijorarenex.pdfIn PDF document text
- https://hijaustabilo.com/contents//files/9888425529.pdfIn PDF document text
- https://detector-billetes.com/Imagenes/file/biwujukenalanu.pdfIn PDF document text
- http://blbr365.com/userfiles/file/1621832017.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a67888f5---17696745993.pdfIn PDF document text
- https://liniagdanskzydowo.pl/files/wuxurubiroxikerezikerug.pdfIn PDF document text
- https://armagedonspedycja.pl/files/file/88774144147.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4b2cff00436ce1e317b87b50351e9203/dawusij.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ratib+haddad+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cf61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF61	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e773.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE773	17448 bytes
SHA-256: `bd37b86d5ca52ad92d182a58deaa01fe9e19fbca4d8b5f3f32bb96093e8ec991`
`font_02_sfnt_off000114d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114D6	10108 bytes
SHA-256: `1b438d3a3aca51f66726cc930f9319c565d9047af49288f8fb9b53db90400401`

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