PDF malware analysis — malicious · 4a80f49d63a56601

MALICIOUS

PDF

93.0 KB Created: 2021-06-26 09:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 85d9bd06eb796827fee6d1addb1044c2 SHA-1: 83d938c6bc1ac9d7c1ee14300aac7d0860bee9d3 SHA-256: 4a80f49d63a5660144ebbc33b667f77ece91bda7c174cdf751b3d2fa65256ce2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple URLs hosted on what appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the embedded URLs and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9786

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 http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc024e07b2---19139086601.pdf In PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160740549ca6df---86039397992.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b82538178c4---tudozukezijuzetumipoluvog.pdfIn PDF document text
- https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/fuwuxoximi.pdfIn PDF document text
- http://dancedynamicsla.com/clients/38740/File/19621105071.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/40717386491.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m5tj8l9rb288s71v3abqlufg2j/famozozanebofex.pdfIn PDF document text
- http://techbis.pl/files/file/jigix.pdfIn PDF document text
- http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2karg0n5f0ie46hmhkl6qk23v0/lokivojog.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708e1e4e615---8871167433.pdfIn PDF document text
- http://jucal.es/images/file/saladanefuxifowodiwaxixa.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afd4a8f9b---fewetoxevufarumifawe.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2036aba7f---75964248552.pdfIn PDF document text
- https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/naig71sqgftul2ponnq7n50lrl/44551108554.pdfIn PDF document text
- http://movementlab.dk/userfiles/file/99287976825.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8f7ifc9fkksgais2etp8agh3u7/navudajefavutilonase.pdfIn PDF document text
- https://alamansyria.com/userfiles/file/81078175091.pdfIn PDF document text
- https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f4a81ffc37c06a697711bdbb1bcb6a97/dutaviza.pdfIn PDF document text
- https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2517c781bf34c364bc8fed60c111b0da/22365889651.pdfIn PDF document text
- http://modamoda.nl/uploads/pic_lib/file/73610421168.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ffe64285b---1098385058.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16073e53beb04f---xirapoxozipetejojumi.pdfIn PDF document text
- http://hilltop1976.com/clients/24685/File/visesumogofixazisabaja.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863bad8feb---rujijokidunutiwobesa.pdfIn PDF document text
- https://bjsteelvietnam.com/upload/fck/file/torupugiger.pdfIn PDF document text
- https://noblacklist.pro/web/img/podborky/files/2530206578.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+upside+of+dyslexia+readworks+answers+pdfPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ee86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE86	18584 bytes
SHA-256: `1918eb9cba6042a1e557a50279dd4303427916fe729e3c7ab05170cac794aa96`
`font_01_sfnt_off00011efc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EFC	16096 bytes
SHA-256: `c5fea09eead39e6bc5cef18776c7946833bff5e37afe528046aac7396583f917`
`font_02_sfnt_off00013434.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13434	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00014c4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C4B	10956 bytes
SHA-256: `410888e51805cc545fd9e8794eb2437a6a4f5e0aaa51f5e47ae08e2167fde2cc`

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