PDF malware analysis — malicious · 38ff3e4357605112

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 00:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d70e77f0b54cf5ed1f7d2ad34acc77bc SHA-1: 93060d1a0a4d7e822ebd679ee8f0ba95b0c27843 SHA-256: 38ff3e435760511254c5c8b5b7ce981835d88e803e78c3b88fb783c7f2e3faf8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs pointing to compromised WordPress sites and disposable hosting suggest a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 6

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.
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://cructi.ru/uplcv?utm_term=manual+air+fry+philco+saude+inox PDF link annotation
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f4ad4577d66b65996a855babfb26c7cf/43757847305.pdfIn PDF document text
- http://gancza.pl/userfiles/file/somamavivamofaxu.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d597e6086---zilogugegimen.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/bd2bfa25d58656ee9eb79cb8d8766a26/78237873488.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16109bb1309e3c---gepit.pdfIn PDF document text
- https://braintreeclinics.com/app/webroot/img/files/juxarigezadifumotoj.pdfIn PDF document text
- https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8eb411463---4963870182.pdfIn PDF document text
- http://francescofesta.it/userfiles/files/fivafu.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5768e3216f---50483994522.pdfIn PDF document text
- http://momsystem.ru/public/file/43976529430.pdfIn PDF document text
- https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9o14f969tv0dap46rv9e6r2m65/jagamufezedojunokejasi.pdfIn PDF document text
- https://atpl.aero/ckfinder/userfiles/files/82706973739.pdfIn PDF document text
- https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e7267f45de657099f6e77c32a374ecce/zifuzopazagelimofobezirop.pdfIn PDF document text
- http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/74730133456.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4a505c914---70645863339.pdfIn PDF document text
- https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ip9k3rb1pjrn7pik4dascvhtin/xoxodovafosodumixedo.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f7d884d44dbd721eb681c0b298fcd632/10971040383.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b462737c2da---38984330200.pdfIn PDF document text
- http://kangs78.com/clients/66216/File/sodoj.pdfIn PDF document text
- http://alexandercdg.com/clients/36029/File/dakixifanutas.pdfIn PDF document text
- http://artgraf24.pl/userfiles/file/54082124430.pdfIn PDF document text
- https://filetorme.com/upload/files/39316270417.pdfIn PDF document text
- http://nusamulticentralestari.com/Uploads/userfiles/files/85064939504.pdfIn PDF document text
- http://armanetti.com/images/zilelezudugixazemeker.pdfIn PDF document text
- http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/82279770238.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/3d752d8c314fa5ce78a3e2774a2f0676/wokosilaruboloxa.pdfIn PDF document text
- http://envigest.cz/upload/file/24244536729.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_off0000db8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB8B	10928 bytes
SHA-256: `aebb237a56275240970ee3a4123fa52fea184b34822cd812c7b66aa24c915f83`
`font_01_sfnt_off0000f4c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4C8	19828 bytes
SHA-256: `b3d789de9e5425bc556425eee6a7e3d7168ca043c072495532ea93d5c93d9fe8`
`font_02_sfnt_off0001290b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1290B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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