PDF malware analysis — malicious · c50e34027379412c

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 20:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: b92b5148f00dd96d8b7cff7be6e35cb6 SHA-1: 727927d53b2e154a7bb007571e8b1c282e119487 SHA-256: c50e34027379412cc3f402d6eeeef6089985f6a641679c8e7559806e28e7a549

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links indicates an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
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://crysiq.ru/uplcv?utm_term=icd+10+code+for+low+potassium+level PDF link annotation
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f60c6d81a---xoruwamita.pdfIn PDF document text
- http://nhs1980alumni.com/clients/878257/File/povovotobedozuxamipub.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20210527212831779.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7bb235d738381fb708da363c2e58cb1c/vijivuxubarutaxij.pdfIn PDF document text
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/8197342f97f0fcff84c6bca672dbf267/xuzefuwivekejavodobogat.pdfIn PDF document text
- https://mauspro.net/upload/files/gigek.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/78003fb78d038f1254d659f3b551a565/vosuxo.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa201398c---12501674427.pdfIn PDF document text
- http://sam-global.info/files/file/16035727737.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb8512cf8---50967980457.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/guxukuxagogufilarodizusab.pdfIn PDF document text
- https://avenue102.com/uploads/file/756534564.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3661f5fa682b294719dd11bc76ee67c9/16686021422.pdfIn PDF document text
- https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090598905ad7---42727051505.pdfIn PDF document text
- https://xaydungdonggia.com/app/webroot/files/images/pages/files/raxezuwumojipojewagopa.pdfIn PDF document text
- https://abicecream.ru/ckfinder/userfiles/files/25300093750.pdfIn PDF document text
- https://zzhqhi.com/d/files/diwaluse.pdfIn PDF document text
- https://arte-salon.ru/upload_picture/25955453488.pdfIn PDF document text
- http://voxel-avocats.fr/uploads/file/40840328178.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160784e59d62b8---59753546389.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609443f64977a---parujopazinezizi.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1579b89998---bupuzonivovenibosunes.pdfIn PDF document text
- https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1de3sh5s9lbub8t47gh9n5k0sk/4559711521.pdfIn PDF document text
- http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/negaxawoxitavewofogifukor.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_off0000e8f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8F8	11052 bytes
SHA-256: `5f5c96e4b91ac821d3dcdc4a1c0b0a97f1f6ae371eb9d3ed0e9c9e1902e7f480`
`font_01_sfnt_off000102db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102DB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011aed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AED	16636 bytes
SHA-256: `af7ce2b7fbcf185d73f346335d399bbac19ee1527b004feb645389b94ebbe3cb`

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