PDF malware analysis — malicious · ef83f3e4557d1c00

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 12:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 2639e4507e0215835351ab7bd2250d93 SHA-1: 8596aa7522601d3c91f35caf58b5553ec6127904 SHA-256: ef83f3e4557d1c009f0c89e99f22b10ca03b5592ecf15cb5819ca28bcbcd3d8d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content are consistent with phishing or malware distribution lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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 https://wastran.ru/uplcv?utm_term=wifi+showing+disabled+on+android PDF link annotation
- https://markmont.eu/editor_uploads/system/files/5272230730.pdfIn PDF document text
- https://www.akilciilacdernegi.com/ckfinder/userfiles/files/wotajuz.pdfIn PDF document text
- http://medizator.ru/ckfinder/userfiles/files/reworivibewidire.pdfIn PDF document text
- https://vsevolozhsk.mebel18.com/uploads/files/gonozilu.pdfIn PDF document text
- http://hoteldanang.com/uploads/images/files/malajat.pdfIn PDF document text
- http://tainanrup.longi.tw/uploadfiles/files/20210905_100118_4500.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431f7e5b8c8---wopasadebig.pdfIn PDF document text
- https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/34889255417.pdfIn PDF document text
- https://vientangluc.com/upload/files/17557255461.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1220b0ed0f5f90805ed117177224aa0a/desoba.pdfIn PDF document text
- https://makojudo.pl/zdjecia/fck/file/dakozaxudopuwavi.pdfIn PDF document text
- http://99hospitalitygroup.com/ckfinder/userfiles/files/27189971628.pdfIn PDF document text
- https://saatyapi.com/upload/ckfinder/files/pagevukumubenumosovapona.pdfIn PDF document text
- https://smartbrand.ro/mm/file/44151001155.pdfIn PDF document text
- https://h1t-url12shio-turbo.com/contents/files/punupe.pdfIn PDF document text
- http://gadkowski.pl/repository/filemanager/file/furubego.pdfIn PDF document text
- http://szzxwx.com/Upload/Upload/file/20219202330558846.pdfIn PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fgegn1ci1q1ug264agb6hs0vvt/xumuwujatinuripikozubixo.pdfIn PDF document text
- http://mispuntossaga.com/campannas/file/39981955092.pdfIn PDF document text
- http://open.ua/uploads/ckeditor/files/tuwivifupoje.pdfIn PDF document text
- https://maintogelonline2.bet/contents/files/dufidaporawazodefetubo.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16148317bb05bf---xemesomapegizuno.pdfIn PDF document text
- https://saigonservices.vn/images/uploads/files/63225748788.pdfIn PDF document text
- https://24emk.ru/ckfinder/userfiles/files/89656866415.pdfIn PDF document text
- https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fd623cb34ba9400ea33577d943329f8e/75633993546.pdfIn PDF document text
- http://reclameindex.nl/images/uploads/51260379534.pdfIn PDF document text
- https://horgaszvelem.hu/ckfinder/userfiles/files/46213548998.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d9a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9A5	10752 bytes
SHA-256: `6cc284b928c0978da5efa141c1299488bdd371296002d64aaf0c71de16a4299f`
`font_01_sfnt_off0000f21f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF21F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A31	18060 bytes
SHA-256: `76f933c4f577a341916afe0cc048ca6e370d1c36258693e2d88bdf97de3ec622`

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