PDF malware analysis — malicious · dada733243416c8e

MALICIOUS

PDF

98.4 KB Created: 2021-08-08 11:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 64c09573c679831f1882408b927015d1 SHA-1: 78b09e2bbf4ba1e3f14e2634707cba046c010c50 SHA-256: dada733243416c8e9c29755d83d7ab0b9654781cbc794ee5ca24a9e3056f7bbd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9885

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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8df53f0071---35373452144.pdf In PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94102a8b7---51932731649.pdfIn PDF document text
- http://oresteruggiero.com/userfiles/files/wozasotagedubunuzavi.pdfIn PDF document text
- https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/8ih2vkl9v2f2neavbd0dj4v6r4/7418863721.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609827c8e8c4b---sexumovago.pdfIn PDF document text
- http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/12440074737.pdfIn PDF document text
- http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a3082a4f7583108617081ac3ddc44406/xasefum.pdfIn PDF document text
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85ac12a2d---86987371589.pdfIn PDF document text
- https://metricgroup.it/uploads/file/71716999430.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/589582cb6f7f0aa957202857908c67f7/kunogovapisopufu.pdfIn PDF document text
- https://hasekei.jp/userfiles/file/nuzaboj.pdfIn PDF document text
- http://jucal.es/images/file/50458634877.pdfIn PDF document text
- https://kuraniterbiye.com/resimler/files/5844637157.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/30555280565.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608062e155230---22450117682.pdfIn PDF document text
- http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915e5c3f3c0---6389974830.pdfIn PDF document text
- http://taxicityplus.ru/userfiles/file/jedaxuludefiwolifemezapi.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc37ef7ba---50884685851.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c65b7c6b4---zufugalutasovagukoxijoxu.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e39b729e4fa---zamevanaduwutixum.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21f271492---2526011404.pdfIn PDF document text
- http://azs-szermierka.pl/zdjecia/fck/file/rowimugewiwipuwajuzipa.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8476ac52---wejevikuz.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2c3cdabeb0eec7618e8767841ea4cebd/47716308591.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+learn+basket+weavingPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000108d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108D1	16164 bytes
SHA-256: `fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467`
`font_01_sfnt_off00011e43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E43	17076 bytes
SHA-256: `42bc4db414576d844c342e5589b85c09979266ce6bc3e8bb2e58bb0a7eb53d64`
`font_02_sfnt_off00014b07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B07	10656 bytes
SHA-256: `3785bc4d1a6832255e53ef585876916358beccf01031a5a4875d2b406e42e54c`
`font_03_sfnt_off0001639b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1639B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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