PDF malware analysis — malicious · 73b00452b252a4b6

MALICIOUS

PDF

93.8 KB Created: 2021-07-07 11:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: be98ae1d7280066a6eadd9c492de8f2a SHA-1: 313a01439189053c8012c6a4fc47c2daa9ce4218 SHA-256: 73b00452b252a4b6c3b51323f83ae3a3fcae2c35491fc0c8533ea70ad549ee1c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing lures. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9941

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://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b411295031d---ziwopivedokaleja.pdf In PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ab1a4ef90---94750319360.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/773e740b60a0e2bd53144a4826dbb931/gosulonikakegepexu.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608312fbf1b29---82341898691.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d534974---vunabusapatofirolesax.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/503d0a20a4086a5227d4a740590a2b5a/82533585684.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/79654cdcfbdfec098df87f9d48c0a7c4/rutinuxoraz.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fc601983e45fa9a942f8f835f9d1df72/73356573112.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a37279e3bbb3c71e598b1d6ecb94e7a8/nutatekovunevoxopexa.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9100454bcd0a8016fb6c63420d71293d/83503284332.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09f2a3a37---refiwogukenanalomuxow.pdfIn PDF document text
- http://colescastle.com/clients/875019/File/luvagemado.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/35290e06be807ddc6cdf093e33828259/5565714044.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16095ceb84cba7---4764512252.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607096d362c08---zesom.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f73bf134b---15396382603.pdfIn PDF document text
- http://wujipacking.tw/upload/files/juruzewutiwoni.pdfIn PDF document text
- http://allaboutdowney.com/userimages/jilazi.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7412331a84---mukejonofawunolujipakagi.pdfIn PDF document text
- http://dongphuctqueen.com/upload/files/xatigikajidulidusujife.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec99168515---5151289126.pdfIn PDF document text
- https://bauarch.bg/files/povef.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=guilds+of+wowPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f821.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF821	1704 bytes
SHA-256: `2d59b2b1bb9a6f9bbf889029c1db5c2207fa4dbd30617e885d593f86b64e3e7b`
`font_01_sfnt_off00010028.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10028	9976 bytes
SHA-256: `58703c183909c0aae75d14c58df386b9627265fa97b0b17b483a04ccf13431c1`
`font_02_sfnt_off00011662.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11662	22848 bytes
SHA-256: `09d98ce9392329ff0dbbe2d976e6b15b1c4acc9397b7fdc0b873f4a611488de4`
`font_03_sfnt_off00015197.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15197	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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