PDF malware analysis — malicious · e39de2bca3d19665

MALICIOUS

PDF

82.3 KB Created: 2021-06-28 17:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: c593bd5556f126a6b0e8b47c401fffea SHA-1: 522862143748a1cfcfac9aa39cfe912dde5aadc0 SHA-256: e39de2bca3d19665a8aee542d3a565be7b9a9854e1446d99c51b7ec4632ad5a8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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 https://irlanc.ru/uplcv?utm_term=tamales+and+chili PDF link annotation
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7f95f14ca1bb16df6151f2eba49542cf/44381438263.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609435381c188---fubapugotemodora.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc184a2987---bogaku.pdfIn PDF document text
- http://rowanfamilyreunion.com/clients/28915/File/nadewilaxexev.pdfIn PDF document text
- https://mimpiindah2.com/contents//files/6095956962.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b12556ec4ef---muxaxo.pdfIn PDF document text
- https://summit-christian-academy.net/scauserfiles/files/97123978071.pdfIn PDF document text
- https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5f382d69d4fdbe3001872bbef1a54f37/visaki.pdfIn PDF document text
- https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9162ba0b8e---burawovex.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f92abc5ab5eb9aef00dcec8030e42435/lejeruf.pdfIn PDF document text
- https://zionapostolicministries.org/uploads/file/lodefabowetab.pdfIn PDF document text
- http://sunwisechem.com/Uploadfiles/files/25040053320.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ece5b744---pesixatoto.pdfIn PDF document text
- https://ewastexperts.com/userfiles/files/namaja.pdfIn PDF document text
- http://muacuoi.vn/Pictures/files/62456739482.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abe75700c8---sekapivasiwavegufa.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609843b5e854f---12659607171.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/854071117.pdfIn PDF document text
- https://zoldlepes.hu/userfiles/file/vazumemovuxe.pdfIn PDF document text
- https://batikatravels.com/userfiles/file/nuxurenutawegepikek.pdfIn PDF document text
- http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/46952720119.pdfIn PDF document text
- https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/835d357bdd46e28fb7c0d45e24fe82ee/55873434471.pdfIn PDF document text
- http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/r3rq33d8mhchcf45g19b9sccs1/miduwegozemumugilax.pdfIn PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/u3mhk1gpjo5i517gh5defltvtk/latoni.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/l0anl6fmh2j99jbg3jnhnjvak7/90194792383.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2hoh1i6l8jflj3plkguskpavv6/73552708458.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dfa0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFA0	10280 bytes
SHA-256: `f15ee24b6c44156c17a98ef695f537e2fddb72b946c4ed7b1b84847e7b6ee146`
`font_01_sfnt_off0000f673.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF673	17360 bytes
SHA-256: `c6f621228053fe618aabbdebf30bb71940fab67d11e5ed29b45ebcf32bd9ee6b`
`font_02_sfnt_off000123db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123DB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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