PDF malware analysis — malicious · 8fa6e7f469006ef5

MALICIOUS

PDF

101.3 KB Created: 2021-09-01 00:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: e85ae3ef8c3291c3e3da56bdc8c86506 SHA-1: 362e4120c3ab25f97c0611ccbfbf96e028e44e7b SHA-256: 8fa6e7f469006ef5191838083655d8d05d99d0d8423016b12ac2304f480be969

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF, likely to redirect the user to one of the numerous external URLs found in the document. These URLs are designed to appear legitimate but likely serve as phishing lures or downloaders for further malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9613

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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://huntic.ru/uplcv?utm_term=bengali+meaning+of+discourse PDF link annotation
- http://mamtomchabahai.com/uploads/files/files/fikazazevilika.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbba97d490a---95556678114.pdfIn PDF document text
- https://ap-qatar.com/userfiles/files/1617656089.pdfIn PDF document text
- http://www.cddfct.com/up_files/file/79293900014.pdfIn PDF document text
- https://amrapalispot.com/userfiles/file/dalawoginubot.pdfIn PDF document text
- http://fecoil.com/userfiles/file/sagewewaxexazosa.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/9odddsbusu0igdrpkfjcrkb684/potevi.pdfIn PDF document text
- http://urdu-hadith.com/survey/userfiles/files/15827228311.pdfIn PDF document text
- https://forthepeoplegov.com/userfiles/file/35586440912.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a346833d845---26034494934.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j9eg7qdoc8vcns6mq63mktlib2/tudowigizuzuwapavepedi.pdfIn PDF document text
- https://eccdc.org/application/webroot/userfiles/file/fonaronafira.pdfIn PDF document text
- http://aryajob.com/user_upload/file/kefanozetajuwabimazufede.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a82d07052---84909553753.pdfIn PDF document text
- http://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/lilatimetesanenowo.pdfIn PDF document text
- http://homeopathyhongkong.org/files/lasenigutilolifen.pdfIn PDF document text
- https://stillwaiting.org/userfiles/file/nenikaju.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9768dff2bef99334c0f483ccd6b4f0c3/26327872801.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff186a46f9---39139009487.pdfIn PDF document text
- http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/5v7jq9a63ivh0mvqnaq0mk8894/8873902495.pdfIn PDF document text
- http://buffagiuseppeinfissi.com/userfiles/files/27311620456.pdfIn PDF document text
- http://bahattinburyan.com/userfiles/file/vufalajijadij.pdfIn PDF document text
- http://swotaweb.com/img/upload/file/13158157338.pdfIn PDF document text
- https://ubk-sad.de/azubi/userfiles/files/29032332098.pdfIn PDF document text
- https://rainbowprinter.com/app/webroot/files/file/40704485700.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i9n2gcn4gq52a66va69cggjcbk/lepemu.pdfIn PDF document text
- https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df9ed60a9cd7b11480bf34f16ebad96e/kinofaf.pdfIn PDF document text
- 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_008_off000163c7.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x163C7	16452 bytes
SHA-256: `aa97bb9325a4baa42e079ad1060a0eb0d7bc62f126be727e61549ca38082669e`
`font_00_sfnt_off0000fa84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA84	10872 bytes
SHA-256: `a68995f706cca0075247d529757aad56895329d73ecc8e6f41087032c55d4262`
`font_01_sfnt_off00011361.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11361	21992 bytes
SHA-256: `f3631c8915097e09dc7d6d0cee5ff0aca4ae1a843f7468331401ecb2a8d30c83`
`font_02_sfnt_off00014bb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14BB6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_04_sfnt_off00017a97.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17A97	1972 bytes
SHA-256: `caadc97dce529c3128021db8e040c736f72f48b2e475b472c889fff828338d64`

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