PDF malware analysis — malicious · 9f1b0dcac073d9d3

MALICIOUS

PDF

87.6 KB Created: 2021-07-06 00:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: c23270c2816c80e27b719ddce497b579 SHA-1: 750e8b1b29502ae657932b9f73cd2f2a29ad68ec SHA-256: 9f1b0dcac073d9d3e130e6b60dd11499e26170c2f691cceab3003dc1e35c024a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to external, potentially compromised, websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://retco.ge/ckfinder/userfiles/files/56970507374.pdf In PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969846b40cf---labotave.pdfIn PDF document text
- http://andlupa.com/userfiles/file/4459114913.pdfIn PDF document text
- http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/joparegusetobamukun.pdfIn PDF document text
- https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/99ca91d5459e90b5091f388243399c63/nugorug.pdfIn PDF document text
- https://bbpartner.cz/userfiles/file/40175496575.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/s4t96g73oubmekr7sf1701hn13/megixafeginineledewotute.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1351a442e1---93808189728.pdfIn PDF document text
- http://videofilm-tv.ru/content/File/71949596030.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f19aee106e2ca6be49cc5fc25065747b/nabotugaguko.pdfIn PDF document text
- http://www.aqsclimited.com/EditorImages/file/bofavemen.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f5aa3ba4---wilonawunotid.pdfIn PDF document text
- https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1218ikmeo7lvgflg2g18k264nr/sudufaninasen.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d331c1eb11---zamubarejide.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a0cc2b561---rizitefonunakofi.pdfIn PDF document text
- https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/944cbc3d7806c0da9223f6426ec41c3c/26981738237.pdfIn PDF document text
- https://canionglobal.com/FCKeditor/file/62858144998.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e7e9ab204219f4e78a5b81a2a8178c30/fofozajefizilaferus.pdfIn PDF document text
- https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ecc13klot3cst909blo3d0pfgc/42823954922.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be27d213101---78909302386.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874e7f458d0---nojufebal.pdfIn PDF document text
- https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fl1n16iugvb098vccn1ikd13um/70761841422.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f487v7opklvth35qldmt6pcquu/daloxukilumi.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/77e4df05343a8a031d272b1e4a539b4d/tadidaburowekekubevej.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e48379d39---54987452581.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5419110dd8---lepubinuge.pdfIn PDF document text
- https://amitadevnani.com/userfiles/file/97781684721.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=take+down+meaningPDF link annotation
- https://tes-sys.com/uploads/ckfinder/files/20210705/16254152332346.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_off0000f7f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7F1	10320 bytes
SHA-256: `5e6ff10247af6a2d16ee7b6593dc1cbce6ccbab8782a5f18cb970792a2d74c6c`
`font_01_sfnt_off00010eff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EFF	16276 bytes
SHA-256: `474930f8c479b20310d8c63ff2ccd626d83b4a8e1cb48f0e94163da4d6271ede`
`font_02_sfnt_off0001393f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1393F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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