PDF malware analysis — malicious · 74a951d389f59d78

MALICIOUS

PDF

89.1 KB Created: 2021-07-21 07:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 62a27950f96eb7a22b3794c931f6a5ad SHA-1: 698fa667fef29bde3d05173161a836a5d1e4ae9a SHA-256: 74a951d389f59d78eefd268c2eb3064763b2c362dc210faf9fedf638dc6a22db

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristics indicate a clear intent to host external links.

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 https://mkycc4.com/kycc4.com/userfiles/files/labizazusuriv.pdf In PDF document text
- http://yorktownhs1987.com/clients/57482/File/3234953134.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/f3ic4pb824p0u9nlek7ss97dnj/10082112381.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m3cib7ti72hpjed5hmv8ifh9i8/23945821231.pdfIn PDF document text
- http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b895bc8ee08---kamokevofimiwodasawes.pdfIn PDF document text
- http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4jdaq50u4u7i86fd27kvrru7j6/fegubekuxowibi.pdfIn PDF document text
- https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b5a708fb---givoxutupu.pdfIn PDF document text
- http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/madupetazujupol.pdfIn PDF document text
- http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/zafuwelebalojumuvug.pdfIn PDF document text
- https://www.gurgy.net/ckfinder/userfiles/files/zuraleridejidusix.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838cde640d8---rodaresopinaril.pdfIn PDF document text
- http://www.vegagastro.pl/upload/file/95165565372.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/mg22g4i9gh20u0fjempjapn8to/dugaxonaluxivosezaz.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd89715502---94924783759.pdfIn PDF document text
- https://fanaf.comarticle_ressources/file/59647594087.pdfIn PDF document text
- http://hieuchuan.com/upload/files/82240231592.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a66660678308efae94a7ab3d8695ba4d/19128176842.pdfIn PDF document text
- https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfa67bc24---49456292566.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26b364dcac---xomogusok.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/72oa36bmjpb3oo0ep9rsggj8g5/gafufizavokiwotidawixa.pdfIn PDF document text
- https://binarbaid.com/public_html/userfiles/file/vupejibawisuritidexa.pdfIn PDF document text
- http://tv-sat.cz/userfiles/file/58535100273.pdfIn PDF document text
- https://mintedimages.com/ckfinder/userfiles/files/42433783113.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/242306c21885e3c85714d3bcc7b721db/40609930488.pdfIn PDF document text
- http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/virovejogevuzafejopujow.pdfIn PDF document text
- http://bluecreator.biz/ckfinder/userfiles/files/3729459375.pdfIn PDF document text
- https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e6ec05bd0d019234c6a6628bb4a1baec/zawasupeganorilo.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36c38c605---91891502194.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=slope+int+to+standard+formPDF 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_off0000f526.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF526	10736 bytes
SHA-256: `435af19cfaf87bf3e38bbf51e414bf1adeb88587c68bd5633b67aff523037121`
`font_01_sfnt_off00010dc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DC3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000125d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125D5	18480 bytes
SHA-256: `31287b23e4fec9653bc22f09540714e8ddd093d0f0c14594318b874106908f55`

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