PDF malware analysis — malicious · b8943d61cf30578a

MALICIOUS

PDF

89.5 KB Created: 2021-07-01 22:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f521e6397422cf395024c4a24dc752c1 SHA-1: 43396eedac10384a149dc7b5a95759aa324f5644 SHA-256: b8943d61cf30578a457c557e7578794fbf4584ce1fc9979e3a5f470011e53894

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/h68tmov1icnpo7dj3804fo8mp1/taxokeruperejeg.pdf In PDF document text
- https://shoreluxurylimos.com/userfiles/files/17697651483.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfdc4efc1e---wibemarurowog.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160762d6b25486---xogunewotemipemamuwojuj.pdfIn PDF document text
- http://dgjinhak.kr/DATA/upload/files/202106291016169204.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db65f855fb1---38416803627.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/c1fccdb87fa490daecadbd276e4e05fd/3502190997.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/19177eb7acac192b2eff81f3441c5330/sulejijexazu.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/85058b3b0a6fd377f5b19d0d901ebe7b/tagazutuvisujazotirizi.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160890b1405d6a---wobuporigakudupinubol.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cad93f008db---xirilexafuwik.pdfIn PDF document text
- http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/98248010336.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813c1627c38---tuxutowosim.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee9d935cf---99414743471.pdfIn PDF document text
- http://autoshiftbid.com/fckeditor/userfiles/file/6768307790.pdfIn PDF document text
- https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2cf7e0deb3fb9457c9adbdfa25bc1930/34357616408.pdfIn PDF document text
- https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pseq2sgs2j6oilsjmu4ibqlha2/25928107905.pdfIn PDF document text
- http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/33734590161.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/0s9lo8stjabn6f0ed8481sqql0/dusefozetex.pdfIn PDF document text
- https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/085c536319d80271171af6c06dd157b0/ludow.pdfIn PDF document text
- https://topinsolventa.ro/userfiles/file/xupokorawikigajadixi.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0f587df7adbf88171d1ee62ebacfab5b/tejifig.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb060f0472---3418127651.pdfIn PDF document text
- https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0ip68r2e3vjphm7iskqa43inin/45202888493.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=snider+of+twisted+sisterPDF 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_off0000fa66.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA66	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011278.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11278	17856 bytes
SHA-256: `06998e05eba14766aea9030fd88b36b0b27edaf759e6b20eeea28fc2d4d618b6`
`font_02_sfnt_off000141a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141A6	10300 bytes
SHA-256: `75c1f86e23d944a5227778eba2d2e3d70cb09be388a783ce0908d4dc6ed60d71`

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