PDF malware analysis — malicious · 1dd4d6dc181681c1

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 05:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 78a809819a615a35e8a05ebef6e833db SHA-1: 6c35906eebe4273df29cc4fa00949a497bb4f7e7 SHA-256: 1dd4d6dc181681c1326f4cb89076ba54730cd5f57b581e996748aaef61fe6d6a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download' button lure further supports this, indicating the file's purpose is to trick users into downloading further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/3cddbca13ccf815fd2d57a3f11ce6173/lefomiranifere.pdf In PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d3bdad448---21703529382.pdfIn PDF document text
- https://ohcsi.com/ckfinder/userfiles/files/49286577653.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cb806f90f32f16ca958f32de55b2cf63/nevejigesisobupufu.pdfIn PDF document text
- https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3b5f0f1d955c00e0d861c026a1751c0e/18255080624.pdfIn PDF document text
- http://alnoorcity.com/userfiles/file/7595077641.pdfIn PDF document text
- https://rimsball.com/ckfinder/userfiles/files/60842727625.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a252a2c7fd4264b702a47e62ebc83b7f/tukibipix.pdfIn PDF document text
- https://hotelmitrutarija.com/uploaded/files/39761353426.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ihgok31ch3ajpf2ug7a6upfm52/wugadagerizelotevu.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17f213cac---wirazexonenopegidam.pdfIn PDF document text
- http://pwr-tech.ru/userfiles/file/16325671806.pdfIn PDF document text
- https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/65b25515f25940e9f1cbac25a0192d35/pamefeguda.pdfIn PDF document text
- https://sca-kc.com/scauserfiles/files/videsivolobeguwe.pdfIn PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fb300237---wovemobebodozetoxed.pdfIn PDF document text
- https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/7da2c6dd574d47ab775d3d9e873c5660/balip.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/eef9b5cdb666a20a850ad67f9dee89f1/tawugebujamejajepex.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c57e427cc---97576681445.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f9916f1285b51f9c3ceb277ab26a2f44/7847805904.pdfIn PDF document text
- http://autolubitel-irk.ru/userfiles/file/6340412732.pdfIn PDF document text
- https://vico-domrep.com/ckfinder/userfiles/files/xexawurazugisufafu.pdfIn PDF document text
- http://honghuibio.com/d/files/562746727.pdfIn PDF document text
- http://pescepiana.eu/userfiles/files/56955250213.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a5c5084d---24350969888.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=storytelling+pdf+download+gratisPDF 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_off0000efdb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFDB	18144 bytes
SHA-256: `eaa87a8477887fd41957fcf286f47fa81f01cf5c2c4d486d680aa566c8af88f2`
`font_01_sfnt_off00011eef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EEF	10948 bytes
SHA-256: `298ea1830c66770513e26a4aac5c9240c3eab9c6f1274b37662cee8d19187345`
`font_02_sfnt_off0001384e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1384E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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