PDF malware analysis — malicious · f4b1b903caaca747

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 12:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 7e412a1d07099f17d1da589eb7b577c3 SHA-1: 0bd9a1a1c0bc00e634e4410df1b3cde5c87afeed SHA-256: f4b1b903caaca747806ba85fff982563509bfea863a3bf69df666546bcf1454a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into clicking malicious links. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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 http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0347f9d2---zufozojejonerogodupav.pdf In PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5e05faa7bd436c0bab1ed6337b860b2e/vubenase.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d1927e43---99028855252.pdfIn PDF document text
- http://jncs.kr/page_data/file/20210609215123.pdfIn PDF document text
- http://nprofit.hk/userfiles/voxatudi.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa6203e9e---85234828634.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9889fc2a---82726413357.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/135aca173aa70c39fd0ed7ec93751d76/wakebatofuforukikigel.pdfIn PDF document text
- http://twfindia.in/userfiles/files/29659324925.pdfIn PDF document text
- http://blpest.com/UserFiles/file/45255298449.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ad913d79c5f---newamipo.pdfIn PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d5bdd589a36b3864933a4305a17b7ff1/5668051894.pdfIn PDF document text
- https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31ff9365e---7295693035.pdfIn PDF document text
- http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/kl54tfs31nv22j8lt1qn9vdkof/78814208905.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/81aaa29073df2984a2a04cc215d5a45d/mibejuvutareviligonil.pdfIn PDF document text
- https://a1-recruitment.fr/v2011/Files/fck_upload/file/2999985943.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf672813fb---wasafiwurodubitevegixes.pdfIn PDF document text
- http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ca0107a8---panetapetiz.pdfIn PDF document text
- http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7aefcf9f9---biwiforamuj.pdfIn PDF document text
- https://dcmheavyequipment.com/admin/images/file/26701885666.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bfcec9908---xejaw.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad866d505a0---20840023708.pdfIn PDF document text
- https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/mmkt969himjujulgjutf0hcgq5/91464827509.pdfIn PDF document text
- https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/1evla3545phfu65o426uhh2ft2/xuwas.pdfIn PDF document text
- https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bc9bb50f7a468c139975c85d75db7b76/98218947333.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c4ed8a570b53c397abe2b7751eeee5e7/wetukabiso.pdfIn PDF document text
- http://lorofilmes.com/Uploads/ckfinder/userfiles/files/vobefedusajasalalerawuve.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rap+music+codes+for+roblox+2020PDF 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_off0000f636.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF636	17536 bytes
SHA-256: `5eabac627e0eed2fa942f98e2b194590c28b298f977bfe3b58363d7223a1e9e7`
`font_01_sfnt_off000123cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013be3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BE3	11208 bytes
SHA-256: `88657afc3d3f9518cd97f6964ddb4d266a2230b6e7bafafbf9ff37e9673bcbf1`

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