PDF malware analysis — malicious · 6ef91b5b231ead0f

MALICIOUS

PDF

98.9 KB Created: 2021-08-13 00:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: 9179c7f0f8c5cef67ee03cc8ba8cf446 SHA-1: d1d7f2a7dc579378080a53d2311efaed6cb2f774 SHA-256: 6ef91b5b231ead0f2b411d9cc280142dac726afe01c1d783d6a2e7b3a15a365f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS uploads and disposable hosting reinforces this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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 https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f011dd24efe5573b5712a0928b0046fe/95769568630.pdf In PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/361a305174ba198898146b7d6532d50e/69158079512.pdfIn PDF document text
- https://skyzoan.com/cake/beta/userfiles/file/sofepuni.pdfIn PDF document text
- http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/qfl72r611cb5eoqrhgkm74lk7k/lakoluto.pdfIn PDF document text
- http://jshtextile.com/UserFiles/file///nibev.pdfIn PDF document text
- http://111-orte.de/testarea/cwsCMSlight/media/files/89843945703.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cd714f560eed62c973b086105baeb388/35026782400.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/eb0d02a09545da7782e3f8add481056a/1420287653.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099c23baefce---38383352890.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8a3656a6---5587798473.pdfIn PDF document text
- https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c81b326025e05b0eb0b4782801812c08/76352555915.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/ec8d7d4d9eaf0a3d88ea4588c13cbcf4/2838439859.pdfIn PDF document text
- http://vankouwenenmastop.nl/UserFiles/file/3318197404.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f5103229a---xosugufixogikar.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c42c02db---xaparasulifilofigisep.pdfIn PDF document text
- http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/653fb0f2f0598012aa73db97f1989c87/56163606363.pdfIn PDF document text
- http://anandtouristcorporation.com/uploads/tezisafirimizejavif.pdfIn PDF document text
- https://wronba.pl/uploads/wysiwyg/file/2179283399.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f97330959---60399871967.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c6c6d41a---2459250512.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16089954e7a8b0---95815621086.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074369089ace---pubukerawu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=more+linear+equations+worksheet+answers+mp3444PDF link annotation
- http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7ba69860c2b38f06f0ee5cf8ad66ec03/5905629274.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_off00011b50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B50	11184 bytes
SHA-256: `20898307d374b4760cbfb75b427fbbb1340f57d766debc1a952e8025e46a41af`
`font_01_sfnt_off00013566.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13566	17936 bytes
SHA-256: `3530211e86fc725c82b438dbe98b6af29263699d4750a3a24bc62371a86f03c1`
`font_02_sfnt_off000164d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x164D0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.