PDF malware analysis — malicious · 1e3e446803c39087

MALICIOUS

PDF

84.6 KB Created: 2021-08-16 08:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b4f886fabb234c80fd4af137708d9df4 SHA-1: b99357cabf3e82e145fbb3c8f9f0a565bab41155 SHA-256: 1e3e446803c390876cd797d1ec03293b078fc940ffb6648aad872abe9378f355

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to various domains, some of which are hosted on potentially compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination or leverage vulnerable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9246

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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
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://pc580.cn/upload_fck/file/2021-7-31/20210731223133660653.pdf In PDF document text
- https://amursvoidom.ru/media/files/66544370612.pdfIn PDF document text
- http://icaalliance.org/filespath/files/20210811233753.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dc8e0be928bbbdb3019098035521debb/25346567949.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f862c44f0---gavefiwolosakazamosara.pdfIn PDF document text
- http://nexxosrealty.com/userfiles/files/dofamafifovagorela.pdfIn PDF document text
- http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/ravegowumitekuvonitadozip.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e657927a---98392677248.pdfIn PDF document text
- http://kelvista.lt/images/files/49410918587.pdfIn PDF document text
- https://cape-electronics.com/media/file/62632232147.pdfIn PDF document text
- http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9ba44cef74459aa39a9619c4b504bd92/zezanesabamilibagilaw.pdfIn PDF document text
- http://saopauloairporttransfers.com/ckfinder/userfiles/files/mibibokuwewapezet.pdfIn PDF document text
- http://ca1970.com/clients/10044/File/lafolanifud.pdfIn PDF document text
- http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/finusetif.pdfIn PDF document text
- https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ec4cf8dadb31e9cffd2125f29d9da4f/fimuzixuvinak.pdfIn PDF document text
- http://carszana.com/image/upload/File/ganazabixixukefeluxinodof.pdfIn PDF document text
- https://tecnicadovolante.com/images/file/19272185894.pdfIn PDF document text
- http://toflight.mobi/attachment/ckeditor/files/fd1ecc0b3195829af1b88953ab2ac56a.pdfIn PDF document text
- https://naveenent.com/administrator/imagetemp/file/morijexa.pdfIn PDF document text
- http://lycee-elm.org/userfiles/file/64984955027.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c783f5d512---99997259833.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+best+setup+for+the+m13+modern+warfarePDF link annotation
- 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_off0000fe02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE02	11260 bytes
SHA-256: `d9257224cc09c230ddc8cd9f29b7d1bd27e8fb8efcb84674bedbe0d675466f30`
`font_01_sfnt_off00011822.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11822	1732 bytes
SHA-256: `5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a`
`font_02_sfnt_off00012056.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12056	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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