PDF malware analysis — malicious · 51ff1a14417e9cfc

MALICIOUS

PDF

108.2 KB Created: 2021-08-10 23:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: ceb7cd87c046269956e06d96a409727e SHA-1: 720f2267de6c1c1a0e4c5a25df4b75186af9d2aa SHA-256: 51ff1a14417e9cfcc9c3161622670a6a33a7063efcee521b603bb0638264ce5c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting it is part of a phishing or malware distribution scheme. The embedded JavaScript likely serves to execute malicious code or redirect the user to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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 https://syteq-pro.com/userfiles/file/75959244406.pdf In PDF document text
- http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46419806139.pdfIn PDF document text
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/3069e7a005e8fa323e20eb7b884e3702/3064306361.pdfIn PDF document text
- http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/repuzobebovodikaxaw.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/i1icl9k94715magdqe9u33j3a1/rimino.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6aa7875d3af651bfa47dd14e5e4e0069/difaka.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5be64b5e6e8ed03daa522c0a229335d3/1578666189.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/10d6d6f38b744215e4502aa75e8c2d6f/74030441186.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0725ea1f1---rabuvepujamifuvatugu.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81e62f7d2---xerivutabebadonaref.pdfIn PDF document text
- https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/4f5066f38ec37a3c2c82dc00cecc7361/87612332477.pdfIn PDF document text
- http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/jasisajaxasusa.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3ac35253---3388790039.pdfIn PDF document text
- https://cihangirhotel.com/upload/ckfinder/files/kanuloreba.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b091ff52---pelaxedataxifutufofa.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04e1e3762---39888079499.pdfIn PDF document text
- http://evevoyance.fr/adh/.-/file/43872529931.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a029fb15b0---wuzozevevefenonelales.pdfIn PDF document text
- https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/moxovofetabepinemapebod.pdfIn PDF document text
- https://cambodiaangkorhomestay.com/userfiles/file/sonegilutebe.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ada53053938---84423407600.pdfIn PDF document text
- http://taeguektour.com/FileData/ckfinder/files/20210712_2051F64803AE9195.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/46b9698e3b32ad053539f4b242cd439a/70363201292.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0281497b---zivorexufokazu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sat+reasoning+math+practice+test+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_off0001413d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1413D	17952 bytes
SHA-256: `acfb7a4c8c64cca488c39cf397460ec8abac887c915ac392c41ae112e8e71334`
`font_01_sfnt_off000170ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x170AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000188c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x188C3	11096 bytes
SHA-256: `2263829c654809c3b25fc01be5f1c0d478254d55b7903edb08e329eba4cbc21f`

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