PDF malware analysis — malicious · 585f80bc5d529b86

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 17:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f3a722be45a0fb9cc3457861da75a788 SHA-1: 9c92c93d8a6f2c67804469846c2c761a72ce9a87 SHA-256: 585f80bc5d529b86079e2fd5f687d82b477591f2d6ba98f00d9c602c5b3e801e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to redirect users to external resources. The presence of embedded JavaScript and numerous URLs, many hosted on compromised or disposable domains, strongly suggests an attempt to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd4b71b2826f60de422582f81d30de07/78463802244.pdf In PDF document text
- http://campfirewtx.org/userfiles/file/vigulenutit.pdfIn PDF document text
- http://scoutpate.com/userfiles/file/perudefetarejiteganuv.pdfIn PDF document text
- http://daeryuhealthcare.com/ckupload/files/zavizarogusur.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf7a5912a---1372403386.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1466819fe---4103632138.pdfIn PDF document text
- https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/rivonidapamibikepipid.pdfIn PDF document text
- http://pengyou-english.com/FileData/ckfinder/files/20210811_367AA4BC8352173F.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1610a38bbe8c83---lupivameguju.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/94443188564.pdfIn PDF document text
- http://fxmeat.com/upload/file/c11d3da9b08782278f11ab62ec350ed3.pdfIn PDF document text
- http://ji-tien.com/userfiles/file/77108397899.pdfIn PDF document text
- https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/6214437371.pdfIn PDF document text
- https://ratsimae.ee/media/contents/file/55425689792.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f027ab91f23dae327f35d9914b901889/gukavowoj.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aeaee9c1b---davaxidiba.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16102e993ca378---75249050966.pdfIn PDF document text
- https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vipikememuk.pdfIn PDF document text
- http://giadinhmedia.com/uploads/files/44699083155.pdfIn PDF document text
- https://szekszardportal.hu/userfiles/file/73366076743.pdfIn PDF document text
- http://pomodorolennep.de/gfx/userfiles/files/medeb.pdfIn PDF document text
- http://irinaburmistrova.ru/files/49268755504.pdfIn PDF document text
- https://cepatdaftargroup2.com/contents//files/84127394115.pdfIn PDF document text
- http://sherwoodonionfestival.com/ckfinder/userfiles/files/wujem.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6a9a684f9770b68d1b6362c4d026e7b1/65390686658.pdfIn PDF document text
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d6430345c3680e95ea4346b7c081bc0a/nerimidomerajajijanuma.pdfIn PDF document text
- https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ed2e049519bc66b62d80f035813b01e3/fokavozekaradurajex.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+printable+reading+worksheets+for+kindergarten+and+first+gradePDF 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_off0000f160.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF160	11072 bytes
SHA-256: `3e61344f8cbfa9738d5ad42a63a3c652d77f9d613f256f4f5b230f6a86bbdc8d`
`font_01_sfnt_off00010aad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AAD	18400 bytes
SHA-256: `e8360e2a3b69c4ba87457de0e958fe1c6fb7d46953a0a062324d1b440284ccde`
`font_02_sfnt_off00013a64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A64	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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