PDF malware analysis — malicious · e931310e20e9e41d

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 02:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: bf1507e110cafea66ca00165491861ac SHA-1: 874259c2581666d85ba828cfe613c8c2fca310da SHA-256: e931310e20e9e41de75c1a6d5721882d912bb5c5cd0ced8e5ea2ce8db4e8cf43

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or link farms. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence, suggesting a malicious intent to redirect users to harmful sites.

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=best+free+voicemail+app+for+android+2020 PDF link annotation
- http://circuitvietnamcambodge.com/hinhanh/file/79397122184.pdfIn PDF document text
- http://hanboo.cn/Uploads/file/2021090609501170554.pdfIn PDF document text
- http://budaikepkeret.hu/uploads/file/78721921317.pdfIn PDF document text
- http://craft-personal.de/userfiles/file/71821110240.pdfIn PDF document text
- https://nuttydog.hu/ckfinder/userfiles/files/41335297558.pdfIn PDF document text
- http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/xofodozo.pdfIn PDF document text
- http://dichvu12h.net/userfiles/file/wejatevunirumivikisokes.pdfIn PDF document text
- https://jairdefreitas.com/ckfinder/userfiles/files/51138494069.pdfIn PDF document text
- https://vanchuyenduongsat.vn/upload/files/sanezixifaziwalumisuluga.pdfIn PDF document text
- https://oncallanatomist.com/ckfinder/userfiles/files/xiteluvumatopemufesifoka.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6f4df458---munifot.pdfIn PDF document text
- https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d238b0fece9ed8b253335ddc51b0f560/mazugufum.pdfIn PDF document text
- https://themis-lex.com/userfiles/files/39870170327.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a852f232f9c87e4a7e0fa5cf3925891a/lurefukokos.pdfIn PDF document text
- https://mtmnetwork.net/uploadEditor/files/netodikib.pdfIn PDF document text
- https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d30c1706446565b683431b57b4240867/36960925445.pdfIn PDF document text
- http://aias.pnu.ac.th/ckfinder/userfiles/files/36915960658.pdfIn PDF document text
- http://kssi.ir/public/userfiles/file/75579523979.pdfIn PDF document text
- http://sushimura1.com/uploads/files/lenarotixakevofilaveseso.pdfIn PDF document text
- http://llux.vn/uploads/files/negane.pdfIn PDF document text
- https://ngusacdon.com/upload/files/69768109842.pdfIn PDF document text
- https://aneri12.cz/res/file/zemexiromiwuvujexunitu.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421a616d3b2---ziwiwepumezesifogepax.pdfIn PDF document text
- http://0851gay.org/userfiles/202109file/2021091222161470554.pdfIn PDF document text
- https://abyway.lv/images/ck_images/files/47173056563.pdfIn PDF document text
- http://ackerviewguesthouse.com/userfiles/file/95765547233.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_off0000edb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDB2	18056 bytes
SHA-256: `52643e7bd2c436078e8f11501b9af92edbd3eefa22c9070e11c37823ff1a1d46`
`font_01_sfnt_off00011ca1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CA1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000134b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134B8	11144 bytes
SHA-256: `4ff986dc07358cc0a62890f9c28a11310cad418af735c1714bb680040a2b14be`

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