PDF malware analysis — malicious · 42c7e405e56ef44b

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 08:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 7b8dc07c6b30d59c0dea60cd53466db6 SHA-1: 6bb63647c99a36a3bc4b8fc89db6d5e386f104f4 SHA-256: 42c7e405e56ef44b3a73f6e7c871046ac18522292658780f4aaa1f6a64d17a2b

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The file contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=type+style+copy+paste PDF link annotation
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/asr824s69le8an193morbk7ak2/fovomejozobaxajivezek.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2785844453c157c29ab1e17ede0d9f0f/16656862047.pdfIn PDF document text
- http://hiroshima-teishaku.com/userfiles/file/34537557649.pdfIn PDF document text
- http://rcp-ranstadt.us/files/55442815554.pdfIn PDF document text
- http://angarakshaksecurity.com/userfiles/file/sinibufemazolitojufun.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9bd32f8e5142252de04b04169d521922/juvetutakog.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/litodelegilazutekilumuk.pdfIn PDF document text
- http://emke.hu/uploads/ckfinder/userfiles/files/gimujajozofawof.pdfIn PDF document text
- http://ipublicity.cz/data/file/51636073241.pdfIn PDF document text
- http://www.pics4us.de/userfiles/file/bokasomomi.pdfIn PDF document text
- http://olsztyntransportmedyczny.pl/userfiles/file/29423723931.pdfIn PDF document text
- http://unternehmensberatung-hegenbarth.com/userfiles/file/92508920541.pdfIn PDF document text
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/33d87f7e5a3edbc740eebf8230783486/fuwaramabagixerofav.pdfIn PDF document text
- https://ocw.tw/uploads/files/luzexafomujesenozima.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ff652fadce3772c54cdd2b45c8e0b4e0/42426045191.pdfIn PDF document text
- https://linlinline.biz/js/ckfinder/userfiles/files/wugevej.pdfIn PDF document text
- http://rem-stroymont.ru/img/file/volafozepenikeluzidij.pdfIn PDF document text
- http://springgalleryng.com/Images_upload/files/21685382440.pdfIn PDF document text
- http://bulk-supplies.com/userfiles/file/27772828246.pdfIn PDF document text
- http://atek-ent.com/upload/file/60036231121.pdfIn PDF document text
- http://freetds.net/userfiles/file/9919374316.pdfIn PDF document text
- https://delphin-restaurant.com/ckfinder/upload/files/37265493691.pdfIn PDF document text
- http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/sakurolezavidikaz.pdfIn PDF document text
- http://hycxchina.com/filespath/files/20210905002123.pdfIn PDF document text
- http://3qlohas.com/CKEdit/upload/files/42197476877.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_off0000d3b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3B5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ebc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBC7	20056 bytes
SHA-256: `e8d240a0353bdc91728d967eebce1910e83a5447cd18712b7c03d48edfe01423`
`font_02_sfnt_off00012011.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12011	10148 bytes
SHA-256: `217954df3ab4f4b27c7b7fbcd04e9fef848b52893c559a7e2ad8313f4fc57cef`

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