PDF malware analysis — malicious · 4c8fd9453f2635eb

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 21:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e1388a0c57ba95154ba9a4c5550d1e0c SHA-1: e1c63a5a84bee4cf970be6b31d7c9c4de3a82f13 SHA-256: 4c8fd9453f2635ebca2a89f79c10d7689c1e396fa96bfec6fd2c7a875c735f88

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with multiple URLs pointing to potentially compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and link farm heuristics indicates a strong intent to direct users away from the current document.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://pro-group.ru/userfiles/files/51073578693.pdf In PDF document text
- http://tokyoracing.hu/userfiles/file/56709824867.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0309d1bc5---siwojoxikuji.pdfIn PDF document text
- http://bxbrdh.marketsearching.com/upload/files/numeserulireli.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2057b5e5b---kesepum.pdfIn PDF document text
- https://www.privathospitaletkollund.com/ckfinder/userfiles/files/galumeguwevogi.pdfIn PDF document text
- http://dancephoto.ru/userfiles/files/girekujepevorevesobafud.pdfIn PDF document text
- http://cokhixnktientien.com/Images_upload/files/16953969759.pdfIn PDF document text
- https://360clothing.in/home/www360cl/public_html/uploads/images/files/wiwazekur.pdfIn PDF document text
- https://mimpishiosatu.com/contents/files/25380273134.pdfIn PDF document text
- http://akconta.com/uploads/files/jijef.pdfIn PDF document text
- http://xn--80aesyq.xn--p1acf/files/file/jatamowami.pdfIn PDF document text
- https://tsolisp.com/files/file/80598161736.pdfIn PDF document text
- http://sensi-leszno.pl/userfiles/file/90538963531.pdfIn PDF document text
- https://dailyhondaotomientay.com/upload/files/dolanadenupozaw.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16140afaa3e1c3---7447317395.pdfIn PDF document text
- http://lafenicealcamo.it/userfiles/files/nanelabexafusilelokulen.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613191111478a---wodabakosada.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594cbf05bf---bexagubaxapulemixewem.pdfIn PDF document text
- http://kvarkeno56.ru/userfiles/file/gubepawu.pdfIn PDF document text
- https://braintreeclinics.com/app/webroot/img/files/15107895121.pdfIn PDF document text
- https://calendarsunrooms.com/userfiles/files/85537854864.pdfIn PDF document text
- http://iamsong.vn/uploads/files/85708344712.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137832667ebd---32640045751.pdfIn PDF document text
- http://addon-colsman.somantec.net/ckfinder/userfiles/files/javobomodusavopilux.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nanny+mania+for+androidPDF 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_off0000e065.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE065	10164 bytes
SHA-256: `0819b490a45f408da3376dda31a160cbc9b3f03915e9170cea51414915b69236`
`font_01_sfnt_off0000f706.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF706	18972 bytes
SHA-256: `424b787a0ee408ebe8393545ce7152bd5fbbaff78dfc08192c3c24e0d268c39d`
`font_02_sfnt_off00012878.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12878	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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