PDF malware analysis — malicious · bcd49fa8f1d4b505

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 07:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: d1eabe1d448e1e6701f5c37831f49b2b SHA-1: e4a2afe03a318b956bb975ff923cc1e2fd5e4c5f SHA-256: bcd49fa8f1d4b5057073e67792a40b95a12d7503befafa6f0630d30ff797d633

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document contains a link farm directing users to numerous external URLs, with several hosted on compromised CMS upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of multiple external links and the nature of the hosting point towards a phishing or credential harvesting campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 http://keifo.ru/ckfinder/userfiles/files/zavabixexirisepox.pdf In PDF document text
- http://palami.by/images/file/30505185849.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/beg1srd6aqkve428eh01t0dgo2/lebidomedafilet.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9f700e23a16a7abc5398b49db4e53caf/81225614599.pdfIn PDF document text
- http://clinical-pain.com/pds/userfiles/files/23181197884.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdd63d608b---mukevegal.pdfIn PDF document text
- http://northcity.rs/slike/files/tosibesagimipepudojediwol.pdfIn PDF document text
- http://jkmdc.com/aversystem.com/userfiles/file/rawumarexezutexonekaxan.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf2936ecf1---6435056670.pdfIn PDF document text
- http://malbreil.com/userfiles/file/29803656648.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/32329136152.pdfIn PDF document text
- https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074884eca6a4---37264861719.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af1809559---95858702222.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9a942bbfac---nazoleteleroxe.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3m222742mk1mh8tij801rjug65/komagizuvomovoropemaxil.pdfIn PDF document text
- https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/82e2e1ba350072b5026462e1dd1539eb/sakofafezarimikovakozef.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160767d5e1c91d---jepet.pdfIn PDF document text
- https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160762c3fe7c8b---medetodemunerelej.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a66b1522c---pometa.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/abee0b923d541caf152c291bb1834577/11761317918.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160703e38366d6---48245560710.pdfIn PDF document text
- http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160871c45e1bf1---87129605937.pdfIn PDF document text
- http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608258d8e6736---18659114924.pdfIn PDF document text
- https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f5147fdf4221ddf90ac79b64a4bb812b/24391555956.pdfIn PDF document text
- http://cmrivestimenti.com/userfiles/files/nuvejogam.pdfIn PDF document text
- http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/63189481865.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=exercises+to+help+ulnar+nerve+entrapmentPDF 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_off0000f4e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4E5	10888 bytes
SHA-256: `042565a97cc33ab695000e07cc5c2652fd7e62bf9225ab9a5367c0792a32b10e`
`font_01_sfnt_off00010def.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DEF	16300 bytes
SHA-256: `43867e4967817593a547b6de446dbfb8249df6912687e5ba69ffb0c9cc0d93b4`
`font_02_sfnt_off00013815.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13815	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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