PDF malware analysis — malicious · 21715bf4a7567517

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 22:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: c758c606c6368d287e4399de44b2b2dc SHA-1: 2f032d3b433da1016fc7cdb1ac5d941a014d8da8 SHA-256: 21715bf4a75675174edf336e64ef7953c8679bf17f927976fdb24c075eaccacb

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript and link farm likely serve to redirect the user to a phishing site or to download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

Heuristics 7

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.
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://smidgel.ru/uplcv?utm_term=5000+sentences+in+english+pdf PDF link annotation
- https://ecableapp.com/FCKeditor/FCKimgUpload/file/46072498995.pdfIn PDF document text
- http://oticonshop.com/ckfinder/userfiles/files/77136539929.pdfIn PDF document text
- http://bukharageorgia.com/sites/default/files/file/kefijibisigovotaj.pdfIn PDF document text
- http://edwardlankin.com/clients/86087/File/zutexesejakozemobatiti.pdfIn PDF document text
- https://albizy.com/ckfinder/userfiles/files/besipifamalumez.pdfIn PDF document text
- https://asoriofrio.org/ckfinder/userfiles/files/walotavapawigepobunozixux.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4bab5bbaace173753c5499a0b2454791/45867026031.pdfIn PDF document text
- https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0763629b27aff67caa3699e47312976f/tuvawaburegugupotefate.pdfIn PDF document text
- https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/betafeguludobes.pdfIn PDF document text
- http://lab4050.com/upload/editor/file/sonipesagegiliwalutesa.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160874b9f8da49---pofikekowujogoluxoradoli.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60961b63e9---77532209913.pdfIn PDF document text
- https://eyetracking.pl/userfiles/file/jejuwuzotilawijab.pdfIn PDF document text
- http://abwcrainhwy.com/uploads/files/60783551382.pdfIn PDF document text
- http://htcable.cn/d/files/zudefusoxajidimu.pdfIn PDF document text
- https://manenshop.com/upload/files/35951514010.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9fe9690f96eab2aa1065c23f8697dbf9/kuwapaxivotikozaxunu.pdfIn PDF document text
- http://friend5190.xyz/js/ckfinder/userfiles/files/wagetimorezulemufo.pdfIn PDF document text
- http://flairpens.ru/uploads/file/50177691757.pdfIn PDF document text
- http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/7145976478.pdfIn PDF document text
- http://artgraf24.pl/userfiles/file/65646373244.pdfIn PDF document text
- https://senfina.top/uploads/files/jujit.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4c9365e8---momirenipa.pdfIn PDF document text
- http://droprint.my/home/ququ4923/public_html/userfiles/file/xekozewirogew.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_off0000c116.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC116	16128 bytes
SHA-256: `e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426`
`font_01_sfnt_off0000d675.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD675	10676 bytes
SHA-256: `a2087e8d545b3fd558fb89567acfaec837ab44528c60582ed9f76bdd152b48f8`
`font_02_sfnt_off0000eeaa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEAA	19196 bytes
SHA-256: `4e78d5833b329db4d7af91d5e174cb5dc6ab67c0da4910a14e6ef3d51616eb79`
`font_03_sfnt_off00011f72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F72	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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