PDF malware analysis — malicious · 16ec3c805ff5e7ad

MALICIOUS

PDF

92.7 KB Created: 2021-09-07 01:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 3963dcc9b21402f4f38633cd8f6a7a17 SHA-1: 0d432cc5c7b7a94dbd3e7256a761e35317ed85d9 SHA-256: 16ec3c805ff5e7ad2a4af3620aa594a640d858043209b1f8f7a7f9932fb03614

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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://amandatravel.com/userfiles/file/wanebeluputuw.pdf In PDF document text
- https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/71e07cce4672a4117df036e93c6d70b0/vimukegaruga.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161150d60216da---6736549997.pdfIn PDF document text
- https://bamfieldrental.com/userfiles/file/10975298840.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f4gtrp6n4o0tftf064gutg0124/surezajogurasujipufejefu.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/151a276ceec46311c2d4f3a8cb183bc8/44358100950.pdfIn PDF document text
- http://duocthientam.com/uploads/ckfinder/files/zizolunekokoxujisu.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2765333651c16cb437429a20801f110f/13865742503.pdfIn PDF document text
- http://crmrealty360degree.in/userfiles/file/wigenigusuti.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d247f46ed3b---julaponojero.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607022d6b7777---difaxawojibegadonaxegor.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/12cec1de6a5364fdfaea04897611e66e/jodaxulonowowu.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad149048d4b---bonoz.pdfIn PDF document text
- http://cuacongtudongbinhduong.com/upload/files/8541363399.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61730d1fb9---20930170847.pdfIn PDF document text
- http://tostonet.cl/ckfinder/userfiles/files/1035521086.pdfIn PDF document text
- https://maxflowfans.com/userfiles/file/59125911029.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09285b9e3d---25803379563.pdfIn PDF document text
- https://ubitanduk.com/contents//files/libuxavofebuxuzunefom.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3cpsjhrb3h8stnrmmijo1bt45i/javavozazo.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/i30146mh632ghdqvth4infs947/kiwazapogujesofete.pdfIn PDF document text
- https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0b57f6e5cf2da82a47328829408e1b5a/93243482622.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7e7b8f057---40399983342.pdfIn PDF document text
- http://stolizstekla.ru/userfiles/file/27315673620.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=circuitos+de+corrente+continua+exercicios+resolvidos+pdfPDF 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_off0000fc4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC4B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011462.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11462	10912 bytes
SHA-256: `a953a347bf53edf258e080cd6d271976f98a24834464726c920453a81d6b6658`
`font_02_sfnt_off00012dd6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DD6	21788 bytes
SHA-256: `ff8dcc4bf6987036afedbe7f93480c2ec9f09939e768b297119b564b5a9e265e`

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