PDF malware analysis — malicious · fb6cb5e8ae0edb6e

MALICIOUS

PDF

84.7 KB Created: 2021-07-17 09:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 10e56349d2930fd0b84f0282fd2681c2 SHA-1: 8396f9e0b83351110e0c11677ce331fc06dc7a66 SHA-256: fb6cb5e8ae0edb6e970f2bbda5de40275e8f7841e0ad321aea7d7b2aa0dd94bd

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to external sites, as indicated by the numerous external URIs found, some of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://duszek-lasu.pl/userfiles/file/68323113999.pdf In PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160768f7974477---82275110953.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a7ad9b867a25bb8749e49bf3a4d545bf/xixowexa.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/d775a1kfi2m4sjadcfjlrqnuhr/68306530510.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2aa4066dca101278f42f5a375c7c1687/nafatovib.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/lljn4o62iubq6f6m5kp7uc2cqf/56328988017.pdfIn PDF document text
- http://kaizousha.com/js/upload/files/53729463913.pdfIn PDF document text
- http://bjhtdszdh.com/v15/Upload/file/20216121647382256.pdfIn PDF document text
- https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ed6791b9ff2481d6a485f1e754157ddb/woxugiv.pdfIn PDF document text
- http://dzbnf.com/upload/file///26811458954.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc381a24cd---2980221774.pdfIn PDF document text
- http://thebrownsfamilyreunion2008.com/clients/81208/File/gosuvinuzubi.pdfIn PDF document text
- http://classicalgardenfountains.com/uplds/file/13354261156.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d877e18ce57---3467623321.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb144ae0db---76272643853.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/lfp5q413116d0oqnv3paapgj12/wumalilutazaxowuvomewufep.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c04036dd218---bogisitomotako.pdfIn PDF document text
- https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/7gv7b5ne7qnav8e54kuhd1cva1/rigutosatafimajafusobotod.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8200d8a9---52650194213.pdfIn PDF document text
- http://kwong-cheong.com/userfiles/25288210447.pdfIn PDF document text
- http://geteffective.biz/uploadfiles/file/xovakakutexivo.pdfIn PDF document text
- http://atenngo.com/admin/sites/site/documents/9906445134.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ef611913---nowijipan.pdfIn PDF document text
- https://landbondcorten.com/attachment/file/38e23472d943ce5e5fc5eeac6ac5a95a.pdfIn PDF document text
- http://abwingssuffolk1.com/uploads/files/11850273527.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=air+fryer+apple+frittersPDF 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_off0000e9d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9D6	10220 bytes
SHA-256: `cb5eaeaf38fdea3608b4c4bdf3b9f1a9d5a1df51553b4106e375bd6c11d9bf75`
`font_01_sfnt_off000100ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100EA	17096 bytes
SHA-256: `d639cab328d910aecd292bc6ce8aef5bcd943fcd0f5d764afc1b004dae08b8f2`
`font_02_sfnt_off00012d6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D6F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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