PDF malware analysis — malicious · 0ff1e69d7f73f033

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 07:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: cfaa1051aa62b072c52bd780b1951050 SHA-1: 6fd2ce5d4d2ef155bf4404d18a01483fbfd05877 SHA-256: 0ff1e69d7f73f03385d7b77993f41f62afe30327d452632ac954d3034e138c3c

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser extension or update, which is a common method for delivering malware or stealing credentials. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://laborke.ru/uplcv?utm_term=3+idiots+movie+download+with+english+subtitles PDF link annotation
- https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c7386716add61fbfad455883c6bc58cf/lunemedabawu.pdfIn PDF document text
- https://agmatbaa.com/upload/files/78544846126.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16071af487b025---57575474801.pdfIn PDF document text
- https://mvpartners.be/images/uploadedimages/file/8375837412.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607151505c32b---81516550843.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed7a3f37f---43750002384.pdfIn PDF document text
- http://kancelaria-perfect.pl/app/webroot/media/files/sodurirenodojixenufakizud.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dc44b3ff4e99c863360ac40f42eea02/78767639978.pdfIn PDF document text
- https://djennebeads.com/nbloom/fckuploads/file/fiwisateduz.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/tjrcdrken7gpcsa10rd5pcv440/rukijewotu.pdfIn PDF document text
- https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/89eb47d210c17b323e3c75877340b4e4/9138763816.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/98a190b1ccb6495db8afb92712e14a6f/jewuregeri.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608421077d9c9---6656853004.pdfIn PDF document text
- https://sjalikave.hu/pictures/file/80233434459.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a27449142cf---25236123252.pdfIn PDF document text
- https://vijyaiprismcrm.com/userfiles/files/jetawidukezavuduvefupaga.pdfIn PDF document text
- http://cavusofis.com/images_upload/files/82660119505.pdfIn PDF document text
- http://akinmedical.com/uploads/file/20107329358.pdfIn PDF document text
- http://thebankcardservices.com/uploads/files/9343812051.pdfIn PDF document text
- https://nanyangtextile.com/userfiles/file/71685313988.pdfIn PDF document text
- https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e92c0d671f0e6a24615065aa1cba81ea/70247221940.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b85fe6c4e---36474832169.pdfIn PDF document text
- http://www.darvidproperty.com/news/file/44222271435.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160900dd47bd7f---kinavovolefebifijavo.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3569c2c0---37375309045.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f82f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF82F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011046.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11046	11060 bytes
SHA-256: `02bb6620da207cd732cf81ae08826570eabd8669b51b4fd50cf1d4f86117fad6`
`font_02_sfnt_off000129a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129A8	17512 bytes
SHA-256: `3219d4caae1a50f073564a872f89d82f33b7bfe4418c21799de7b22f6b079a63`

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