PDF malware analysis — malicious · 65d07880f0c09906

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 16:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 6ffa1ce2cd3cacbda69e7c8118c0b723 SHA-1: fb7dcd899dfc5e6c28160d1aca6cac05400f51d7 SHA-256: 65d07880f0c0990649d8393ffc5822e90ed98c6e6bfbfc078dfcc63e0ca8512b

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate destination of the malicious payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=iphone+video+to+android+converter PDF link annotation
- https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ro1nmfq1fhn5764kgmq4285kv3/vedulufowegudevukoluvi.pdfIn PDF document text
- https://www.habitat-morvan.fr/ckfinder/userfiles/files/saperebe.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/8482657829.pdfIn PDF document text
- http://tantex.org/tantex/tantexuserfiles/file/42438610445.pdfIn PDF document text
- http://radyoislam.com/resimler/files/36521455283.pdfIn PDF document text
- https://gadd-asso.org/userfiles/file/xodaxuniwa.pdfIn PDF document text
- http://crosswaysrecruitment.com/userfiles/file/wesonirikejizemiriwo.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/89852d8a7808096dd712e11cdd62fab2/20147358970.pdfIn PDF document text
- https://www.tunnel.de/files/uploaded/file/37017847047.pdfIn PDF document text
- http://www.bc-arman.kz/ckfinder/userfiles/files/1849626700.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161441fe5454ff---95040009225.pdfIn PDF document text
- http://planet-for-events.de/userfiles/file/55961786147.pdfIn PDF document text
- http://www.eatvirukai.lt/uploads/files/nalimotifexejin.pdfIn PDF document text
- https://drlanda.hu/user/file/novokemiwonuxigup.pdfIn PDF document text
- http://rejs2013.cycling-recycling.eu/imgturysta/files/61005249149.pdfIn PDF document text
- http://portalinmobiliario24.com/uploades/fckeditorfile/15842981338.pdfIn PDF document text
- https://3drm.bg/uploads/pictures/files/mexaxadofominutezidapab.pdfIn PDF document text
- http://cyuanmei.com/userfiles/file/84467357523.pdfIn PDF document text
- http://hsound.ro/images/custom/file/76241179585.pdfIn PDF document text
- http://orosweb.hu/ckfinder/userfiles/files/mumudirigufurapatipisig.pdfIn PDF document text
- http://improntediteatro.it/userfiles/files/82789267438.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c3844c8e---50836422997.pdfIn PDF document text
- https://hatinhjobs.com/upload/files/34642926301.pdfIn PDF document text
- http://kaizousha.com/js/upload/files/30572938920.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2ab420167b3780ec65f37f5312827cd7/mezojodox.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_off0000b0eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0EB	10412 bytes
SHA-256: `538263017c0edb665592a9a8927c7d4b348c8b8d2be6f92614a4e8fe3dd327f9`
`font_01_sfnt_off0000c875.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC875	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e087.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE087	15816 bytes
SHA-256: `57f49d1e77987a9faa8af9fa5933d997b876a3ddd19b8f80cce3841d2f54b966`

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