PDF malware analysis — malicious · 55fd781c4455e745

MALICIOUS

PDF

94.3 KB Created: 2021-07-03 00:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: ddf4f01aaa4e9f74f265b03a70a35f43 SHA-1: b2a7b428af3b8e96fb71ad2baa32e8303f939f38 SHA-256: 55fd781c4455e74509938e3fa581fcbacec43e2f8285fa21d92022fbeb817e01

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0aec8d24---54495500013.pdf In PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d21356e466---42885736262.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ade50f4864b8488008273297594d71ed/41168210460.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4646b24901---lixogijojavofefatiwojen.pdfIn PDF document text
- http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609270eb5694a---guxinune.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/hgsiouco73edbrj0nhsnaipt8b/7994552968.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/46b0b93c03c94f4e94cb193794b7c0bf/sipivaxemalazoteleninobon.pdfIn PDF document text
- http://4grd.com/cmsimages/file/xojakugi.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/8mb2k8at2aa5arbag7rq8lerku/sibolinolevogoduwupugep.pdfIn PDF document text
- http://www.knickmeier.net/images/pageimg/file/98182660512.pdfIn PDF document text
- http://actybrain-consult.com/Upload/files/50068578560.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf29d617a---66272221335.pdfIn PDF document text
- https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9746a6372cd729117ff54c926970fb5b/30276888841.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba07ed3e23f---37555985307.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18882a9f4---56596256599.pdfIn PDF document text
- https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/c95982ceb6257c257d210eae043f288f/86734849352.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9af55678d---voparud.pdfIn PDF document text
- http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7dcd5b6cba501063921e9a617c38f8d8/xapimidudisox.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab72a5deb93---sugad.pdfIn PDF document text
- http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/xanub.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790aa06da70---pokux.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/096afdb56bfb51fb916fd7ff4119a565/duwugajugujopokopari.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=brian+r+nelson+western+political+thought+pdf+free+downloadPDF 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_off00010aa9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AA9	18072 bytes
SHA-256: `14d2fdd0ba95fcce488528556540f0c5ca302e5130e60e309b8b6b67305f6802`
`font_01_sfnt_off000139cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139CD	11140 bytes
SHA-256: `21fca0e89225fc85997b20f1609f227f1b44612a3548d8756c258d75b4b6cd69`
`font_02_sfnt_off000153a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x153A6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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