PDF malware analysis — malicious · e993fb45a923332f

MALICIOUS

PDF

87.1 KB Created: 2021-07-05 21:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: f8f59fe05755f8d8dd3251145edecbc6 SHA-1: 20288a45cce1496e58a7e6276267e3ef067cb705 SHA-256: e993fb45a923332fbe1e4871fa4a29cf508c272a81866a09c5faef2a7fea45d2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs and compromised hosting points to a common pattern of using malicious documents to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854ecbb28d0---12203432860.pdf In PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1df6e120e---49308800552.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d6545ec06c7---gibilijibogux.pdfIn PDF document text
- http://herningbadintra.dk/app/webroot/upload/files/80259355431.pdfIn PDF document text
- http://mkngsp.ru/upload/files/26356835678.pdfIn PDF document text
- https://all-stage-meditation.tw/uploads/files/60bd56aee413a.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/604f6e7044394591523b3f75f1d4f935/duxetavuperekojojako.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609134eaa07b1---25207876563.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d3628905---85231709716.pdfIn PDF document text
- http://highgaincomposites.com/img/file/20217221637.pdfIn PDF document text
- http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/bezibisesedide.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c971e904081---bavijos.pdfIn PDF document text
- http://lws-realestate.com/userfiles/files/523194404.pdfIn PDF document text
- https://anmimar.com/royal/userfiles/file/65263877408.pdfIn PDF document text
- http://georgekoldun.com/var/upload/file/wuvag.pdfIn PDF document text
- http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/nozugufebosajimokibigili.pdfIn PDF document text
- https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0b862cdc4---91201271500.pdfIn PDF document text
- https://pakistanchristiancongress.org/userfiles/file/46762163859.pdfIn PDF document text
- http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dd5214074---8502076275.pdfIn PDF document text
- http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/zizozarov.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/mipifowubowewexekomok.pdfIn PDF document text
- https://groupunsur1.com/contents//files/49113759874.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/sk4gkt2acdtmc053d3ga9ltph0/93452890172.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o8ltotdh7o5e60p2dr1ev4v1r3/duxewuvipomuketanigunif.pdfIn PDF document text
- http://auldskoolrocks.com/clients/878384/File/94935426962.pdfIn PDF document text
- https://vvpta-irvine.org/userfiles/file/zelet.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=normal+blood+pressure+and+pulse+by+agePDF 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_off0000f17b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF17B	10876 bytes
SHA-256: `d73013b31f00b0ffd07a07cb91af0f39daa3c19ce0a6d9529248f89138ab9f41`
`font_01_sfnt_off00010a27.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A27	17140 bytes
SHA-256: `1398e31cb01fcd3a884bb72b22380037865c59fb22939ab4b7e734d94aebeba1`
`font_02_sfnt_off000136f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136F5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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