PDF malware analysis — malicious · fe360544e45162fb

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 03:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b5cd4890f37403bb65972551836cbe5c SHA-1: 52ae744c45e69852d69816210464628c4b15309d SHA-256: fe360544e45162fb11380952bfc0f90c0e8414ee1be785d91192ea2a546f8d8d

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 it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malware or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://tichdiem.surecare.vn/uploads/userfiles/file/8907597463.pdf In PDF document text
- http://prosefkuchare.cz/userfiles/25064260103.pdfIn PDF document text
- https://visualmotion.nl/uploads/file/pifepamegamodowudoju.pdfIn PDF document text
- http://okun.su/upload/file/23044843354.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/8gkk8em42u0j1gf0b7ub1iejmd/55475521228.pdfIn PDF document text
- https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/28431760248.pdfIn PDF document text
- https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/266374776425e274c389cd26cf3f327f/wipezejunonagifujisinof.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5gjr9njv250hijpl00husi0ec2/29572327062.pdfIn PDF document text
- https://dancleland.com/img/upload/file/21504346510.pdfIn PDF document text
- http://specialcats.nl/media/files/60026895276.pdfIn PDF document text
- http://lamorenj.com/userfiles/files/xemopiw.pdfIn PDF document text
- https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/bozevaned.pdfIn PDF document text
- https://12shio2.com/contents/files/lunirivilijebiji.pdfIn PDF document text
- http://sportsclinicwest.ie/media/contents/file/vuzegebonit.pdfIn PDF document text
- http://nieruchomosciklodzko.pl/files/file/rogajiwokerulitex.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ec048c382276b794c8c3b4f2b87cb0d6/bowowunederapopirumuk.pdfIn PDF document text
- http://www.siposferenc.hu/html/kevepowuzusimivasik.pdfIn PDF document text
- http://facilitymanagementassociates.com/survey/userfiles/files/wisakisemuniwiwerozukesox.pdfIn PDF document text
- http://m2m2design.com/userfiles/foboponolagebuperekemagog.pdfIn PDF document text
- https://isabellepieman.com/userfiles/file/labezerosinibum.pdfIn PDF document text
- https://ohcsi.com/ckfinder/userfiles/files/feguverinelafov.pdfIn PDF document text
- https://tylbm.com/Upload/ckeditor/files/30726147048.pdfIn PDF document text
- https://vozilasavozacem.rs/files/7677948088.pdfIn PDF document text
- https://drbumbnursinghome.in/ckfinder/userfiles/files/34905554220.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=actors+in+chips+tv+showPDF 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_off0000b711.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB711	10264 bytes
SHA-256: `7a898b968e1d96ca09919178c976ac79e816b724aa09fbb26d7d6769015eb361`
`font_01_sfnt_off0000ce1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE1F	15320 bytes
SHA-256: `e00dd31afe49690d734d1b940c77a54190e4f4c59f9e30a9389a5a810899cc37`
`font_02_sfnt_off0000f4dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4DD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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