PDF malware analysis — malicious · 8f964ab9f3e5dcf5

MALICIOUS

PDF

88.1 KB Created: 2021-07-13 16:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ebd2cf1ce8c639f5def3e15b2d2314f5 SHA-1: fad753d318ca12347d7ffc9465abd1b62ef48fbd SHA-256: 8f964ab9f3e5dcf5c638e9c0e5ad25d6a3ec36efdb0ef67fea2f66b10af175e8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_URI heuristics indicates a strong intent to direct users to external URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

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://nomylo.ru/uplcv?utm_term=an+introduction+to+formal+logic+peter+smith+pdf PDF link annotation
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a71a0m14hoo2sq06k5givlq5ja/juxepujiside.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867237a97cd---87418043881.pdfIn PDF document text
- http://okmarin.ru/userfiles/file/50903135475.pdfIn PDF document text
- http://akinmedical.com/uploads/file/89258105619.pdfIn PDF document text
- http://buergerforum-tirol.at/file/viwujajumulosu.pdfIn PDF document text
- http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/6010133967.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b756f7a6671---xakapipiluxivoterujukaruk.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/kozuwama.pdfIn PDF document text
- http://wsp.pl/userfiles/file/vibos.pdfIn PDF document text
- https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/cmvlqps708b84tpaek9gicjdjj/donikaj.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0425bed832e03ffe556214785cb3191e/80696888905.pdfIn PDF document text
- https://ka-base.no/images_content/file/foweruduxe.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mpevdrrlnsljobj8gp5nk2etki/93960605040.pdfIn PDF document text
- http://architects-desk.com/uploadsfile/37323444292.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e8118bd0a6ec93974a1606391472cb10/xadigimojofanezom.pdfIn PDF document text
- http://alexandercdg.com/clients/36029/File/2063991776.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743581a4cea---23161714305.pdfIn PDF document text
- http://dok-vo.ru/userfiles/file/bugamerobezaxuxipezuwuvif.pdfIn PDF document text
- http://forglass.sk/userfiles/file/tuvibafo.pdfIn PDF document text
- http://tsg-edinstvo.ru/userfiles/file/23693250480.pdfIn PDF document text
- http://atreve.eu/ubezpiecz/obrazy/file/82999880324.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed5f5f681---jipusototojesazorex.pdfIn PDF document text
- https://jurad.eu/files/file/57730615358.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd6889ddde---palavezuzimiv.pdfIn PDF document text
- http://drapa-technika.cz/UserFiles/File/luxonotorabuzipimewari.pdfIn PDF document text
- http://www.gamylai.vn/uploads/files/nukuwukaseb.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cfd6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFD6	11036 bytes
SHA-256: `9ae9c39f26ec11128fa5bf701c95146d9b5d1e43df143246f326c53e703ded13`
`font_01_sfnt_off0000f244.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF244	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A56	17008 bytes
SHA-256: `472e8ebba8ae7c90e808bab7243fc8713cbcb880e70f1b3f3d54802b5171b311`
`font_03_sfnt_off00013674.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13674	11148 bytes
SHA-256: `3339fe34fd10aa88c3b4dc43f006a84980e08079ea9bd1704c372f0541f0e894`

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