PDF malware analysis — malicious · d4aec2f50266486b

MALICIOUS

PDF

89.1 KB Created: 2021-06-27 16:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 93c33f3c6b8c8edfd91acaf210ae4700 SHA-1: 327663a5ca367209fdbefdf386109fb8da0c0539 SHA-256: d4aec2f50266486b9df6f3aafb3c126b057908f4d182b5a5f6cfb3333125d7e3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by an ML classifier and contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting. These URLs likely serve as a link farm to redirect users to phishing sites or download further malicious content. The presence of these links and the overall structure suggest an attempt to lure users into clicking them, aligning with a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 5

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://oniceh.ru/uplcv?utm_term=supple+and+soft PDF link annotation
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740b43349c3---85043923468.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0860c3a1ed---40134179907.pdfIn PDF document text
- https://autoprofi.ua/userfiles/file/vivitebawozeluw.pdfIn PDF document text
- https://bandai-k.com/userfiles/file/71283671390.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30b43bf5cd---57549858763.pdfIn PDF document text
- http://solee.cn/ckfinder/userfiles/files/bugef.pdfIn PDF document text
- http://minutemen-jrotc.com/clients/84940/File/67747424779.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac7e663f8---6076230831.pdfIn PDF document text
- http://www.rotudavid.com/ckfinder/userfiles/files/wikifeworodituru.pdfIn PDF document text
- https://perfecthospitals.org/FCKeditor/file/99795867899.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gtelm7empuoofajghddjbdv4r4/misubegosodobupo.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ced07651a93---57951151087.pdfIn PDF document text
- http://sjhrz.com/images/upload/File/90496335374.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec25a18465---15250154686.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1spuoqn0rc5jv3mi7q1d5agoap/3766858780.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070395a33799---36686351829.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bcbc67f1c3a76b2a045e2b111c6c0dda/dawanikepetimubinupirir.pdfIn PDF document text
- https://hashtag.school/userfiles/file/minowoxifojipinij.pdfIn PDF document text
- http://biosafety.biz/ckfinder/userfiles/files/lejugaromowezakidemonokux.pdfIn PDF document text
- https://unosms.us/userfiles/file/83162242996.pdfIn PDF document text
- http://bitite.lv/media/txt/122/file/90029082971.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jm0fodjsr2hbqr3okho9aml7ek/gokugesuwowijatovunapura.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e598c62634---9071186292.pdfIn PDF document text
- https://landbondcorten.com/attachment/file/52ad66397188c30e0b3444ba74f04b89.pdfIn PDF document text
- http://parkwaywest1974.com/clients/861606/File/futamebewajovifob.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_off0000fab5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAB5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000112c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112C7	17192 bytes
SHA-256: `48e4be57840181d5818d0cac4264a11ad0ad9da8e0c844a42b99ebe0d285dcaa`
`font_02_sfnt_off00013fb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FB0	10476 bytes
SHA-256: `bafb81092ac642580cba6d8dc3b231fef7d98100edf5569caca3284d68762de5`

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