PDF malware analysis — malicious · 5e71ce266ab053ef

MALICIOUS

PDF

85.8 KB Created: 2021-07-01 13:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 31551d3a1d67a53123ce650e6f15c6ed SHA-1: 15b9fe81d5babaa811f270581989c44b51aa548a SHA-256: 5e71ce266ab053ef019a29f43bc716053cafe1ebc32dace90036342285f46d53

172 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links pointing to potentially compromised or disposable hosting, indicating an attempt to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 8

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://sincaremedicaltour.com/js/upload/kubawokopepegi.pdf In PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cea3e88e---30285070993.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608a85be0a371---fizewaripajuzemaropesi.pdfIn PDF document text
- http://ibtaker.ps/userfiles/file/53013087708.pdfIn PDF document text
- http://vaonhaphatphap.com/images/uploads/files/kanowopobuxofix.pdfIn PDF document text
- http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3166313e4a0b5758ebdac5e170e8a516/99086145372.pdfIn PDF document text
- https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a01483ad252305b35e59db61c542db49/buworusorit.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/09ebba24b55553d66ebca952b2224c23/20010283613.pdfIn PDF document text
- http://group-anons.ru/userfiles/files/nulapudiwetedenuvul.pdfIn PDF document text
- http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/juparubotubezulab.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5f0e0b45---42478655360.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c5c3c655---31204839537.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/134a825d582e137e6b42e35f884a50ed/galokukorivuwuxib.pdfIn PDF document text
- http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f116ee683b---towoto.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cec9ff372cc44aaf9ba2d8bece1d8f1c/kofifoxakazip.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fc9v89hopsr1us0bmep5uej597/8373310588.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56cb4a981---fujiz.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070c72f59eca---xediro.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb29d173e---96591405118.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2154d0ba---supolejowaxirixe.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c342c9df744---69714113604.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823b7e5e89b---suzonopuladolonad.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5e46362a69acb01caac909780aa5ea0d/rajolejege.pdfIn PDF document text
- http://www.bash.cl/media/file/wegelowinesus.pdfIn PDF document text
- http://www.aluvascientific.com/UserFiles/file/21717629306.pdfIn PDF document text
- https://glbtrader.com/userfiles/file/movegibitokepiwiginakijet.pdfIn PDF document text
- http://zafirkort.com/uploads/files/neviwexugediwukijoxipagos.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7qsvlmdn6bq2ra6mppl0os9p55/wujeserepe.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=performance+measurement+in+operations+managementPDF 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_off0000ee5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE5C	16248 bytes
SHA-256: `110604f3ea3e342c323fcc2bfbd2fa0fa2e7ccf2e2d9b2354eb9438d4722c1ca`
`font_01_sfnt_off00011828.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11828	10876 bytes
SHA-256: `5836543f53cc5113d82134421d5cf99fa3b47790c876038cdc961107899f77c9`
`font_02_sfnt_off00013158.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13158	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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