PDF malware analysis — malicious · 67be9799e4f7d4e7

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 00:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: a093da50e59a2696a483073a5b1a5913 SHA-1: 180b6eaa3d3c3984ae2ca0d20837ac840e7c593e SHA-256: 67be9799e4f7d4e7cea90418bccbe6146b16238dfe4d8b222cc484cf3686fdbd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 https://krisoc.ru/uplcv?utm_term=regrouper+2+fichiers+pdf+mac PDF link annotation
- https://hospvetcentral.pt/site/upload/file/38113778843.pdfIn PDF document text
- http://www.hzkontejnery.cz/ckfinder/userfiles/files/32722789972.pdfIn PDF document text
- https://tvmreza.tv/ckfinder/userfiles/files/4694591781.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3f71bed897b34813a969e89c594c2b02/xeverewewabomiwu.pdfIn PDF document text
- http://teacherandtraining.com/coj_u/KK/userfiles/files/95052374707.pdfIn PDF document text
- https://tonwen.org/userfiles/file/21195040540.pdfIn PDF document text
- http://satisfytech.com/ck/upload/files/mukafevaluvafabukiwarut.pdfIn PDF document text
- http://airconbank.com/upload/fckeditor/file/71020428018.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3so2dgsohc50go1nfjaq761bks/magazimupelineni.pdfIn PDF document text
- https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/60as967p131g2gl6el0jur5ch4/27748771331.pdfIn PDF document text
- https://asesoriagade.com/app/webroot/files/files/pugekedugebor.pdfIn PDF document text
- http://wabasnb.com/files/fckeditor/file/129757878660c076522e3e5.pdfIn PDF document text
- http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a163c222e7b---94802245701.pdfIn PDF document text
- https://songhong.info/userfiles/file/sudiso.pdfIn PDF document text
- http://kondicionery-fryazino.ru/upload_picture/file/widofesapixox.pdfIn PDF document text
- http://harissarantis.com/userfiles/files/pozaf.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3ffbb62e---51938800470.pdfIn PDF document text
- https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/54094458056.pdfIn PDF document text
- http://penzion-u-zamku.cz/files/file/resewenakodokoz.pdfIn PDF document text
- http://baodieptailor.com/uploads/2021-08-28/images/files/71910189452.pdfIn PDF document text
- https://cuatudongbinhduong.net/uploads/files/49353921669.pdfIn PDF document text
- http://mwflower.com/upimagesfile///bosix.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771dc97f21b---jotibavirakune.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fe90a029b---84113293438.pdfIn PDF document text
- http://vanprodukt.cz/UserFiles/File/53578888180.pdfIn PDF document text
- https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/t0omh875jk9l123caeogeui1mu/41115591178.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_off0000ed69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED69	19348 bytes
SHA-256: `6e155c9db8221262d57420473c3ed376eb1a97ac60f0390acb16c79b26c8bdd5`
`font_01_sfnt_off00011e2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E2C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013643.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13643	11084 bytes
SHA-256: `f196cd7bdd461fcc4b01f4738257ec487c84dc2bd006f6d20c307bc2bf45a5c6`

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