PDF malware analysis — malicious · dbd5e09e276cc589

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 14:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 1350ff1649ed49bbae6b8cc85aef417c SHA-1: 076fc44c1771a57d9aae45d28b94755dcbd353d9 SHA-256: dbd5e09e276cc589a00f9c3aad637672c20ca01e1b792eff49511e05082582a9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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 http://elesi.eu/fichiers/files/selodolaziwirarufowisumas.pdf In PDF document text
- https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/fe9d98b5e4505ee4ec51839d590a5176/21840033600.pdfIn PDF document text
- http://sys-svinding.dk/userfiles/file/83446998176.pdfIn PDF document text
- http://ctcinsulator.com/uploads/file/nabofuxavi.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22c17e782---gukalosigazokadunitu.pdfIn PDF document text
- http://tecnoservizi.com/userfiles/files/52306382765.pdfIn PDF document text
- http://reicar.dk/userfiles/file/lijanezidojilefupeva.pdfIn PDF document text
- https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/o76lv7qif59gugltvpbd920vnc/52535692592.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8b25a0d0790db7c67d82b53206624565/68085553784.pdfIn PDF document text
- http://hi-techfiber.com/userfiles/file/37259485855.pdfIn PDF document text
- http://zonweringbelgie.com/ckfinder/userfiles/files/19417761122.pdfIn PDF document text
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/h9d4teqenqutvepsa3aubjtsio/tawijulejakazekawibodad.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad2ead40e8---jowurodusuruselina.pdfIn PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2m94s0fo71ahihoemh39kqioe2/29116316638.pdfIn PDF document text
- http://ubytovani-budejovice.cz/picture/vtextu/file/3581282090.pdfIn PDF document text
- http://deurenhanger.nl/userfiles/file/puxivun.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82a2b2965---96302621097.pdfIn PDF document text
- https://cafesca.org/ckfinder/userfiles/files/87351360221.pdfIn PDF document text
- http://fszhenjia.com/upfolder/e/files/20210603080845.pdfIn PDF document text
- https://duvarkagidierzincan.com/userfiles/file/xazunomogogavi.pdfIn PDF document text
- http://parethumukalchurch.com/uploads/file/kilabemu.pdfIn PDF document text
- https://legouic-peinture.fr/userfiles/file/luver.pdfIn PDF document text
- http://siblom.ru/files/upload/file/89298427135.pdfIn PDF document text
- http://indagosrl.it/userfiles/files/venaj.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=scientific+method+procedures+worksheetPDF 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_off0000dea1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEA1	11028 bytes
SHA-256: `5b0c37013d063e6aed789e9129c6bfbb09cbe115ba81a3a40b9f71eca74c513d`
`font_01_sfnt_off0000f821.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF821	17156 bytes
SHA-256: `fffed87dba1370b52673263bd8191778748c407ee17f9b9c3a7a3a7be2c9ef4f`
`font_02_sfnt_off000124b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124B9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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